Solid idea and nice level design. The puzzles were very innovative and different from each other since they didn't follow a single pattern as to what needs to be done to not get locked in. The movement felt a bit sluggish. If there was one thing I'd improve it'd be the overall juice, which is not one thing btw :"D , so feel and player feedback. Camera shake (where applicable), particles, more SFX, e.g. when the gat opens/locks for things and diversity (e.g. multiple sfx for the jump), changing the tile art up a little (the background and tiles).