It's important to give some thought to your control scheme. Pressing 1, 2, or 3 while also using WASD for controls is very awkward. It might have been better to map the shapes to buttons used by the right hand, or to use the arrow keys for movement.
In the tutorial it was also quite frustrating to step off the ledge after squeezing as the square, only to then end up falling near the spike with little to no warning, the first time around. You need to give your player a chance to react.