Good work.
Sorry, I didn't finish. Will try to point out some stuff that I think annoyed me or prevented me from wanting to keep playing so that if you keep working on the game you can think about and improve. Some honest feedback time, that I think is really valuable.
The 'no air control' jump is fine for games with focus on precision platforming, but for a puzzle platformer like this, I think it only creates unwanted frustration. At least for me, unfortunately. You are trying to mix puzzle elements with precision platforming elements, which is really hard to do, because the experience these two genres creates are kinda opposite. In puzzle games, its hard to figure out what to do, but once you do, executing is easy. The fun is in finding out what to do and in what order. In precision platformers, its easy to figure out what to do, but executing is hard. The fun is in executing. When you mix the two, it is hard to tell if you messed up in the puzzle side (what to do) or the precision side (executing). I think the slide also enters in this feedback point, because sometimes there are big gaps in the level that you have to slide jump, instead of creating a platform, so there is an overlap of mechanics to this goal.
The HUD is really big, and stay in the front of some level texts. There is a level in which the text is exactly behind the mask ui, and if you try to walk forward to reveal the text, you fall into spikes. Also, it looks like the game is kind of puzzle based, but you give a lot of answers in the text I think, which kinda removes the 'aha moment' of the puzzle. If you give me an 'elevation mask' and gave me some room to test I would go "ooh, so it goes up automatically, maybe I'll try to make a platform under my feet" and then I would test this hypothesis, and have the cathartic moment of solving the mystery. But when you tell me the answer even before I tested it, you killed this thought process that makes puzzle games fun in the first place.
There are other minor issues, but I think these 2 were the points that came into my mind the most while playing. I hope I could help! To improve this game or as experience to next projects!
Good work! Congratulations on the game. Keep learning and improving :)