Hey! Really cool game :) I noticed one small Unity physics issue: if the player is falling next to the side of a cube/platform and holds A or D into the wall, the character can “stick” to it instead of continuing to fall.
This is probably collider friction. You could try adding a Physics Material with Friction = 0 to the player collider (and set Friction Combine to Minimum), while keeping your ground detection separate. That usually fixes wall-sticking like this pretty quickly.