Very polished! I'm impressed! The visuals, the tutorial design are super clear and intuitive, and once the mechanic is introduced you good to go! Never seen such a mechanic in a platformer. Where you need to avoid spikes, but also get in touch with them once you set a checkpoint yourself (by throwing a checkpoint ball). For now, the levels are quite easy, but I'm sure that you could experiment and make crazy puzzles with it. Overall, a fun platformer with a twist ;)