Cool mechanical movement :)
I do like being the projectile and I think it would be quite good if not for one issue, the collider for the player bullet is quite big. I especially had some trouble in level 3 after small corridor past the shooting thingy. If you make player collision a little more forgiving, the game feel will really improve with it. Good job making a game on your own though. I don't dare doing such a massive task on my own.