Thanks for your feedback!
I just fixed the coin problem, and exported it to a new version, but only for linux. As far as the walls, I'm not quite sure what causes it just yet, but I'll work on it!
I was wondering if you could help me with the windows compilation problem. Since I am on linux, I've tried compiling for Windows but I'm not quite if there is an easy way.
Also, thanks so much for your help finding these issues! I really appreciate it!