Good start, there are a lot of part of the game to polish.
Some suggestions:
- Add a material with 0 friction in unity. his will make go down the player when goes against the tiles and walls (https://docs.unity3d.com/Manual/class-PhysicMaterial.html)
- The rewind with E is to fast.. I think you have to work with deltatime (https://answers.unity.com/questions/296336/timedeltatime.html)
My game is a casual game if you wanna rate is https://misterm.itch.io/mixtape-match , Thanks