diff --git a/rc/filetype/crystal.kak b/rc/filetype/crystal.kak
index 96804bee..c2b429c8 100644
--- a/rc/filetype/crystal.kak
+++ b/rc/filetype/crystal.kak
@@ -7,6 +7,7 @@ hook global BufCreate '.*\.cr' %{
 
 hook global WinSetOption filetype=crystal %{
   require-module crystal
+  set-option window static_words %opt(crystal_keywords)
   add-highlighter window/ ref crystal
   hook -group crystal window InsertChar '\n' crystal-new-line-inserted
   hook -always -once window WinSetOption filetype=.* %{
@@ -15,14 +16,110 @@ hook global WinSetOption filetype=crystal %{
   }
 }
 
-provide-module crystal %[
+provide-module crystal %🐈
+  declare-option -hidden str-list crystal_keywords 'abstract' 'alias' 'annotation' 'as' 'asm' 'begin' 'break' 'case' 'class' 'def' 'do' 'else' 'elsif' 'end' 'ensure' 'enum' 'extend' 'false' 'for' 'fun' 'if' 'include' 'instance_sizeof' 'is_a?' 'lib' 'macro' 'module' 'next' 'nil' 'nil?' 'of' 'offsetof' 'out' 'pointerof' 'private' 'protected' 'require' 'rescue' 'responds_to?' 'return' 'select' 'self' 'sizeof' 'struct' 'super' 'then' 'true' 'type' 'typeof' 'uninitialized' 'union' 'unless' 'until' 'verbatim' 'when' 'while' 'with' 'yield'
+
   add-highlighter shared/crystal regions
   add-highlighter shared/crystal/code default-region group
-  add-highlighter shared/crystal/code/keywords regex '\b(abstract|alias|annotation|as|asm|begin|break|case|class|def|do|else|elsif|end|ensure|enum|extend|false|for|fun|if|include|instance_sizeof|is_a?|lib|macro|module|next|nil|nil?|of|offsetof|out|pointerof|private|protected|require|rescue|responds_to?|return|select|self|sizeof|struct|super|then|true|type|typeof|uninitialized|union|unless|until|verbatim|when|while|with|yield)\b' 0:keyword
+
+  # Comments
+  # https://crystal-lang.org/reference/syntax_and_semantics/comments.html
+  # Avoid string literals with interpolation
+  add-highlighter shared/crystal/comment region '#(?!\{)' '$' fill comment
+
+  # String
+  # https://crystal-lang.org/reference/syntax_and_semantics/literals/string.html
   add-highlighter shared/crystal/string region '"' '(?<!\\)"' regions
-  add-highlighter shared/crystal/string/fill default-region fill string
-  add-highlighter shared/crystal/string/interpolation region -recurse '\{' '#\{' '\}' fill meta
-  add-highlighter shared/crystal/comment region '#' '$' fill comment
+
+  # Percent string literals
+  # https://crystal-lang.org/reference/syntax_and_semantics/literals/string.html#percent-string-literals
+  add-highlighter shared/crystal/parenthesis-string region -recurse '\(' '%Q?\(' '\)' regions
+  add-highlighter shared/crystal/bracket-string region -recurse '\[' '%Q?\[' '\]' regions
+  add-highlighter shared/crystal/brace-string region -recurse '\{' '%Q?\{' '\}' regions
+  add-highlighter shared/crystal/angle-string region -recurse '<' '%Q?<' '>' regions
+  add-highlighter shared/crystal/pipe-string region '%Q?\|' '\|' regions
+  # Raw
+  # https://crystal-lang.org/reference/syntax_and_semantics/literals/string.html#percent-string-literals
+  # https://crystal-lang.org/reference/syntax_and_semantics/literals/string.html#percent-string-array-literal
+  add-highlighter shared/crystal/raw-parenthesis-string region -recurse '\(' '%[qw]\(' '\)' fill string
+  add-highlighter shared/crystal/raw-bracket-string region -recurse '\[' '%[qw]\[' '\]' fill string
+  add-highlighter shared/crystal/raw-brace-string region -recurse '\{' '%[qw]\{' '\}' fill string
+  add-highlighter shared/crystal/raw-angle-string region -recurse '<' '%[qw]<' '>' fill string
+  add-highlighter shared/crystal/raw-pipe-string region '%[qw]\|' '\|' fill string
+
+  # Here document
+  # https://crystal-lang.org/reference/syntax_and_semantics/literals/string.html#heredoc
+  add-highlighter shared/crystal/heredoc region -match-capture '<<-(\w+)' '^\h*(\w+)$' regions
+  # Raw
+  add-highlighter shared/crystal/raw-heredoc region -match-capture "<<-'(\w+)'" '^\h*(\w+)$' regions
+  add-highlighter shared/crystal/raw-heredoc/fill default-region fill string
+  add-highlighter shared/crystal/raw-heredoc/interpolation region -recurse '\{' '#\{' '\}' fill meta
+
+  # Regular expressions
+  # https://crystal-lang.org/reference/syntax_and_semantics/literals/regex.html
+  # https://crystal-lang.org/reference/syntax_and_semantics/literals/regex.html#modifiers
+  add-highlighter shared/crystal/regex region '/' '(?<!\\)/[imx]*' regions
+  # Avoid unterminated regular expression
+  add-highlighter shared/crystal/division region ' / ' '.\K' group
+
+  # Percent regex literals
+  # https://crystal-lang.org/reference/syntax_and_semantics/literals/regex.html#percent-regex-literals
+  add-highlighter shared/crystal/parenthesis-regex region -recurse '\(' '%r?\(' '\)[imx]*' regions
+  add-highlighter shared/crystal/bracket-regex region -recurse '\[' '%r?\[' '\][imx]*' regions
+  add-highlighter shared/crystal/brace-regex region -recurse '\{' '%r?\{' '\}[imx]*' regions
+  add-highlighter shared/crystal/angle-regex region -recurse '<' '%r?<' '>[imx]*' regions
+  add-highlighter shared/crystal/pipe-regex region '%r?\|' '\|[imx]*' regions
+
+  # Command
+  # https://crystal-lang.org/reference/syntax_and_semantics/literals/command.html
+  add-highlighter shared/crystal/command region '`' '(?<!\\)`' regions
+
+  # Percent command literals
+  add-highlighter shared/crystal/parenthesis-command region -recurse '\(' '%x?\(' '\)' regions
+  add-highlighter shared/crystal/bracket-command region -recurse '\[' '%x?\[' '\]' regions
+  add-highlighter shared/crystal/brace-command region -recurse '\{' '%x?\{' '\}' regions
+  add-highlighter shared/crystal/angle-command region -recurse '<' '%x?<' '>' regions
+  add-highlighter shared/crystal/pipe-command region '%x?\|' '\|' regions
+
+  evaluate-commands %sh[
+    # Keywords
+    eval "set -- $kak_opt_crystal_keywords"
+    regex="\\b(?:$1"
+    shift
+    for keyword do
+      regex="$regex|\\Q$keyword\\E"
+    done
+    regex="$regex)\\b"
+    printf 'add-highlighter shared/crystal/code/keywords regex %s 0:keyword\n' "$regex"
+
+    # Interpolation
+    # String
+    # https://crystal-lang.org/reference/syntax_and_semantics/literals/string.html#interpolation
+    for id in string parenthesis-string bracket-string brace-string angle-string pipe-string heredoc; do
+      printf "
+        add-highlighter shared/crystal/$id/fill default-region fill string
+        add-highlighter shared/crystal/$id/interpolation region -recurse '\\{' '#\\{' '\\}' ref crystal
+      "
+    done
+
+    # Regular expressions
+    # https://crystal-lang.org/reference/syntax_and_semantics/literals/regex.html#interpolation
+    for id in regex parenthesis-regex bracket-regex brace-regex angle-regex pipe-regex; do
+      printf "
+        add-highlighter shared/crystal/$id/fill default-region fill meta
+        add-highlighter shared/crystal/$id/interpolation region -recurse '\\{' '#\\{' '\\}' ref crystal
+      "
+    done
+
+    # Command
+    for id in command parenthesis-command bracket-command brace-command angle-command pipe-command; do
+      printf "
+        add-highlighter shared/crystal/$id/fill default-region fill meta
+        add-highlighter shared/crystal/$id/interpolation region -recurse '\\{' '#\\{' '\\}' ref crystal
+      "
+    done
+  ]
+
   define-command -hidden crystal-new-line-inserted %{
     # Copy previous line indent
     try %(execute-keys -draft 'K<a-&>')
@@ -35,4 +132,4 @@ provide-module crystal %[
       kak -f '%1scheck_ident_or_keyword\(:(\w+\??), \w+\)<ret>y%<a-R>a<ret><esc><a-_>a<del><esc>|sort<ret>'
     }
   }
-]
+🐈