The rewind mechanic works pretty well but it's a shame the game just end after the first checkpoint

Your game is a great start, especially for a first submission. I like the animation you put into the player model and your scene was colourful. Unfortunately I can see you didn't add more levels in the time given, but with practice you can really do something with this game.

A tip, for the player model I would lock the rotation on the rigidbody, to prevent the player from rotating - which happened when i jumped over the block.

Otherwise keep up the work and hope to see what you do in future game jams. :)