Thank you for the feedback!
Yeah, I noticed that bug on level 7 slightly too late. I spent about 2 hours before I submitted debugging the WebGL version, and then decided to take a break until the morning. It worked on the Windows build but then failed for some reason after I changed the build. IDK. WebGL is weird.
Also yea, a skip/speed up animations option would definitely be a good idea. It does get fairly tedious to watch the angels move back and forth or disappear/reappear a bunch of times, especially if you have to redo the levels.
Hopefully I can also fix the background issue in future updates.
Glad you enjoyed it!