What an awesome little game! I really liked the simple art direction and color palette, it reminded me of something like a Downwell metroidvania, which is great, even if it did come slightly at the expense of making rooms a bit more samey. The short story was intriguing and the animations were excellent. I especially loved the player character's attack, its animation and how much polish went to really perfecting it. Beating up enemies and the fun boss at the end was a breeze in only the positive sense of the word.
The little music you've got here was also really good; I don't really like how sometimes these metroidvania just try and emulate that snappy/catchy Metroid Prime vibe by prioritizing their melody and techno sound instead of actually capturing the atmosphere, which you/your team definitely did better than most. Really enjoyed my brief time with this one. However, I'd like to make a few politely critical notes:
I personally wasn't a huge fan of how incredibly quickly you gained speed in the air, and I overshot my precise jumps a few times in places where it didn't really feel like I held it for too long. While I think the surprisingly high jump height relative to the player's size is fine, I'm not quite sure if it works alongside the very fast air speed.
I also would've hoped for a bit more interesting selection of items. Seeing as this game is quite short it could've benefited from two upgrades that were more distinct, so they'd break up the game's pace in some different ways. Maybe you could've rolled up the two current upgrades into one unlock, or given one of them to the player from the start, so you could then have another that did something completely different. It's nothing bad, not at all, but I could've seen something more making this world even more fun to backtrack. Really liked the game nonetheless!