i like the attention to detail where holding the jump button makes the player jump higher, little touches like that really improve a platformer! the rewind mechanic is also really cool, although along with moving and jumping and pretty much every action in the game would really benefit from some sound effects. excited to see where this goes if you do in fact continue with it!
also heads up it's typically best practice to put the .exe and .pck together and zip them for the itch upload