Introducing your main gimmick was super cool and fun - that was a really cool, yet informative, way to tell the player what's going on (aside from the title of course)
Thanks for the feedback! I might add a platform too far out of reach so that players who don't understand it immediately don't get frustrated right at the beginning, and have the spacebar break into multiple pieces, but for a last minute idea I think it turned out pretty cool :)