I've been following the progress on your YT channel, and I think this is shaping up to be pretty great. The controls feel (mostly) great. More on that below. The mechanics are fantastic and even with zero instructions it's really intuitive to figure out exactly how each object works and the little tricks that are possible in order to solve the levels. At least, so far.
The downsides are few, but I think important. First, the jumping is a bit... odd at times. It seems your jump height is determined by your forward velocity. This is common in this kind of game, but there's a few places where if you aren't going at max speed and jump at just the right point, you're going to miss the jump and in these levels at least, the two or three spots where this was an issue, I fell down to a point where I had to restart the level (through the retry system or just having to go through all the obstacles again, it's the same result.) I'm sure you've heard of the game design philosophy of Coyote Time? I wonder if you might implement something in the reverse? If your forward momentum is high enough, missing a ledge by a few pixels will place you on the ledge anyway. It would make up to higher ledges where there's a pit if you miss feel a whole lot better.
Finally I wonder if it's possible to have you exit from the pipe above the level you have just completed rather than all the way back to the start of the hub? I know it's a small thing, but over the time spent in one hub this can add up, especially if hubs ever get bigger than this one. Just something else to keep the flow of the game going without any more downtime than necessary.
Looking forward to what's to come.