Thanks for your feedback! In the end I decided to make a better player following algorithm for the mouse and cat, so this problem will be gone with the update. For the harder difficulty, I wanted to just make the cat/mouse faster, but your idea seems more clever and fair at the same time! In the game it kinda looks weird to eat the mouse while the mouse is invincible, because there is no more point in eating it. With this idea, it looks more realistic and I like the fact that your play as a cat will affect the game later!