This game is mechanically really fun, the wall jumps feel sticky and deterministic. The BGM is very subtle and unobtrusive, I think it gives a good cadence for jumping, almost like a rhythm mechanic. The monochrome visuals are attractive and a little bit nostalgic as well, like one of those "100 in 1" hand held games from the early 2000s.
Some of the levels I got after level 7 were basically impossible with how the spikes and blackholes were positioned so if you take this forward that will need to be fixed, and obviously the little chap maybe deserves a happy ending one day XD
All in all a really tight and polished entry, great work!