So bugs I'm currently aware of are:

• Newgrounds version is laggy on music and quite a few other things.
• Any of the version when played on a mobile browser have no music. The files that the music is encoded as probably isn't compatible with mobile browsers. I'll see how to fix this.
• I've seen a repport about a staircase not working.

There's probably more but this is what I've seen so far. Let me know if you find anymore!