Really unique thing, probably my second favorite so far. I liked how the abilities were kind of asymmetric in the sense that more angles doesn't necessarily mean better movement, when comparing pentagon to hexagon, but I think you could do this for the other shapes as well; maybe you could make the square jump higher and stay in the air longer than the pentagon or make the triangle move faster than all other shapes. Obviously even more shapes would be better, but I just came up with a final circle to the mix (even though it technically has infinite degrees and not 900), which could roll on walls but not jump or something like that. Also, in terms of releasing the angles back, I'd place them right where the player is standing (and giving them an "ignore" state that turns off when you leave its hitbox), or at least not make them stack. Maybe you could also replace the triangles with right-angle symbols, since you're only really adding 90 degrees each time.
Anyhow, the wall of text means that I really like it, so good job!