Hi, thanks for letting me know~
Could you let me know a couple of things to try and find what the problem is?
1. What browser are you using?
2. Does the game crash or just look strange?
3. At what point does it happen, when you complete level 2 or some other time?
I'm not sure I'll be able to fix it, because it looks more like a rendering/unity webplayer problem. But maybe I'll be able to find out why it's happening.
Thanks~