I'm with pfrangip on this. I feel the difficulty does tail the line between Normal and Hard (much like how Petals II tails the line between Hard and Very Hard imo). Good level! I only have a couple of complaints, though:
1. I didn't realize there were save points at first since the background behind them uses a color that doesn't contrast that well with the point itself. I feel using a darker color would have worked better in terms of visibility.
2. The holo powerup makes some of the challenges later on a bit easier than they should be. There were a few points where I could easily just sneak past half-a-dozen-or-so enemies that would usually kill me if I didn't have holo on, and it made some of the challenges feel a bit lopsided, imo. Not sure if that was on purpose, but at least the level wasn't too hard!
Either way, it's still a good level. Really dig the unique aesthetic style. Can't wait to see what you make next!