Certainly shows the making of a good platforming series, the art style and music were on point. I especially enjoyed discovering all of the secret areas and interacting with the environmental 'puzzles'; though it took a while to figure out the trick to the steam vents.
Some platforms still need some work however. I found myself slipping off towards the ends of stone platforms at the first section of part II which might need some hit-box correction. The jumping is also not as responsive as it could be.
Great charm to this game, good luck on your next installments!