Very good game! A challenging combination of puzzle and plataform skills that keeps you playing for a long time. Funny graphics and sfx :) I struggled with the first two-key level (the one in the screen capture, I think) (more than 40 replays easily), and was completely stuck in the next level (I believe it was the next one; the one with a pit at the start). The reason is that, although I think I know what needs to be done, I can't seem to master the jumps over the spring guy. Some times I get a high jump while others the jump falls too short. [Probably I am missing something, if that is the case I would appreciate a hint :)]
In conclusion, congratulations for a very good jam.