Ah, I remember briefly seeing someone play this on stream. Finally played it myself, and while I failed miserably to get to the end, I had fun! The lack of checkpoints really hurts the experience, as pointed out by pretty much everyone else, but other than that there's not a whole lot of bad things I can say about this game. One thing I would like to say is, and this is probably just me, but it felt a bit arbitrary that you jump from the floor onto the ceiling, but you can't jump from the ceiling onto the floor. While playing, it felt to me that they should be the same action really, and therefore have the same command. I understand why you can't just jump from both (if you could, it would just be VVVVVV), but what about not being able to jump at all and having springs on the floor as well as the ceiling? Of course, the level and enemies would have to be redesigned, but it might be an idea to consider. Keep in mind I'm not telling you to remake your game or anything of the sort, I think the game works brilliantly, this is just some food for thought. Great job with your entry!