One tiny issue I’d have — no worries though, nothing terrible, you can safely ignore this as I’m mostly commenting to comment — is that in some of your levels you show it’s hard to distinguish between the background and the foreground, as the colours are very similar. The easy fix is to turn down the saturation, maybe play with the lightness/contrast a bit too
EDIT: that was the easy fix, your other solution being to shift a bit the background towards blue, and the foreground to red; at least that’s what I usually do heheh
J0