Nice game, I like the idea of changing the form with different "powers".. The is a little bug after using 3 times the clock I couldn't get back to main screen or restart the game..
Also you can check the friction on the wall. (https://docs.unity3d.com/Manual/class-PhysicMaterial.html) if will make the player go down when is against a wall.. right now look like it gets stock..
Also when you destroy the boxes you can make some particle effects and sound effects.. right now they disappear..
My game is a casual game if you wanna rate is https://misterm.itch.io/mixtape-match , Thanks