The S-curve on the level with all the spikes was too much for my lack of platforming skills. But overall very good game. The only real suggestion is to do inverse controller playtesting, to ensure that you aren't out-skilling your average player base. The hook shot is surprisingly intelligent in its placement. It wasn't until that S-Curve level that I felt like it wasn't going roughly where I wanted it to go, or better. The only small bug I noticed is that the bottom spikes don't seem to be harmful, even though this could be seen as a bug. I think don't change it, let the player naturally fear it without actually being in any danger.