My original goal was to create a night scene where only the cat's glowing eyes were visible, so I ended up neglecting some visual details. Your feedback was incredibly helpful!
Regarding the movement, I initially used an elliptical collider. I only realized after finishing the levels that the movement felt a bit too slippery, but I wasn't sure how to fix it. The link you provided completely solved the problem! Now I can adjust other parameters for better control instead of just relying on changing the collider. Thank you so much!!!(≧▽≦)