This is an impressive entry and probably one of the best, for reasons others have already mentioned. It's big and ambitious and feels solid. Good work.
I think my criticisms mostly echo others and have already been addressed, but I'll write them anyway for your consideration:
1. The controls were serviceable for me until the shift jet mechanic. At that point I felt like I was fighting against the game and fantasizing about how it would be like to play with a controller. The platforming challenges became tedious at that point (which is unfortunate because they are well-designed).
2. Opinions probably vary on this one, but I was not a fan of how the wall-grip/wall-jump mechanic affects movement through the map. I didn't like how I couldn't just run and jump through the map, because if I ran into a little wall, I had to take care or else I'd propel myself backwards. It made movement less fluid. In general, the wall jump felt more of a chore sometimes than I wanted. This especially was the case in stair-step type rooms.
3. The environments could be more visually interesting. There were definitely some big, empty, somewhat boring areas (especially in the start), but there are so many challenging plaatform rooms later on that I ended up not minding so much.
Honestly I just want to play this game with a controller and see how it goes. I'll be looking forward to the update.