Not terrible. Needs a little work.
The monochrome is a nice touch, yet as the game progresses it's painful on the eyes. The music , nothing wrong there, the same with the graphics.
As for the jumping and scrolling, that is where the problems emerge. Some of the leaps are far too impossible and the margin for error is very slim. YET, it is not a simple hitbox issue so it's far more acceptable.
The apparent speed increase from sliding doesn't do much when at some points of the level the collapsing cave over takes the player regardless.
All and all, it is very well made game- Just with a few issues. I can't decide between a 7 or a 5 .