Awesome game!
Very nice artwork. Also it's very quick to understand how to play and get the hang of it.
The game's quite fast and stressful haha but in a fun way though! Hitting the hourglasses is super satisfying.
The movement feels a bit unresponsive at times, so maybe look into things like coyote time. Checkpoints would be nice, and it would be nice if you had a button to restart whenever you'd like on the death screen.
Great job for your first jam and welcome to Unity.