Pretty cool! It gets really tough in the end.
I noticed a few things you might want to fix:
- In level 4, I barely moved 10 m before the level was completed.
- After a few attempts at level 5, the same thing happened when the level restarted. I got told 'Thanks for playing' and that was it.
- I can't replay any levels from the level menu, the ball won't move. I refreshed the web page and it works now.
- In the credits, I noticed your name is missing. The most important credit isn't there, haha.
- Having a long uncopyable link in the credits is not the best idea.
Good work so far! Keep creating!