Not bad. Art and music is nice, but no sounds. Movement is responsive, but physics/collisions are very awkward - player can get standing on ledges or even ceilings, wall jump doesn't work properly if you keep holding move in direction of the wall, ball-spike doesn't kill you and just pushes you away with a strange force. Don't get what's the point of stopping time when you don't move, I thought there would be some puzzles around it, but it's just a useless gimmick. Checkpoint doesn't reset your time limit.