diff --git a/frontend/game.ts b/frontend/game.ts
index acf5a89..17dd4cd 100644
--- a/frontend/game.ts
+++ b/frontend/game.ts
@@ -54,7 +54,9 @@ function draw() {
     });
 }
 
-//
-// function keyPressed() {
-//
-// }
\ No newline at end of file
+
+function keyPressed() {
+    if (key.toLowerCase() == "k") {
+        raspberry.boost();
+    }
+}
\ No newline at end of file
diff --git a/frontend/models/Entity.ts b/frontend/models/Entity.ts
index 77f699b..1424271 100644
--- a/frontend/models/Entity.ts
+++ b/frontend/models/Entity.ts
@@ -30,7 +30,7 @@ abstract class Entity {
     }
     //endregion
 
-    constructor(position: Position, width: number, height: number, fill: number) {
+    protected constructor(position: Position, width: number, height: number, fill: number) {
         this.position = position;
         this.width = width;
         this.height = height;