This is really well-polished! My only suggestion for me is that it has too much acceleration and deceleration speed for a precision platformer game. Other than that, dayyum this is a really good game!
The hourglass was meant to kinda balance out the crazy speeds you could otherwise reach, but with some fine tuning I'm sure we can come closer to something even better! Thanks for the feedback, and of course: Thanks for playing! :D