diff --git a/config/dotfiles/.config/kitty/kitty.conf b/config/dotfiles/.config/kitty/kitty.conf
index 0d3bd4b..9cd4fef 100644
--- a/config/dotfiles/.config/kitty/kitty.conf
+++ b/config/dotfiles/.config/kitty/kitty.conf
@@ -5,4 +5,4 @@ initial_window_height 24c
 enable_audio_bell no
 confirm_os_window_close 0
 
-background_opacity 0.4
+background_opacity 0.7
diff --git a/misc/wallpaper.jpg b/misc/wallpaper.jpg
index e078e2a..41fae6a 100644
Binary files a/misc/wallpaper.jpg and b/misc/wallpaper.jpg differ
diff --git a/modules/apps/dev.nix b/modules/apps/dev.nix
index e9daaac..bdb7bd5 100644
--- a/modules/apps/dev.nix
+++ b/modules/apps/dev.nix
@@ -29,7 +29,10 @@ in {
       jetbrains.rider
       jetbrains.rust-rover
       jetbrains.webstorm
+      kotlin
+      kotlin-language-server
       mono
+      nixd
       nodejs_22
       platformio-core
       python313
diff --git a/modules/apps/terminal/helix.nix b/modules/apps/terminal/helix.nix
index a7b2bfd..b33d97b 100644
--- a/modules/apps/terminal/helix.nix
+++ b/modules/apps/terminal/helix.nix
@@ -6,6 +6,7 @@
 }: {
   programs.helix = {
     enable = true;
+    defaultEditor = true;
     settings = {
       theme = "catppuccin_macchiato";
       editor.cursor-shape = {
@@ -14,11 +15,6 @@
         select = "underline";
       };
     };
-    languages.language = [
-      {
-        name = "nix";
-        auto-format = false;
-      }
-    ];
+    languages.language = [];
   };
 }