An interesting twist on the Metroid genre! The level-design is a bit confusing at times. There are very few check-point and dices at the start, it's easy to get stuck on a couple of run without progressing. I also encountered later some hard platform sections that led to nothing, or just didn't have enough checkpoint to allow to go further. I went as high as I could, with a lot of upgrades, but wasn't able to find the end. Also losing some upgrades feels really bad. Especially double jump and wall-jump: it made me feel like I've lost a lot of progress and must go farm for another couple of runs before being able to explore again. Globally there might be some adjustement needed to make the game feel more balanced, with a better feeling of progression.
But beside this, it is still a fun platformer! The physic is really great, controlling our character feels always nice. Movement is fast and fluid, while stille remaining precise. And once you obtain enough upgrades, it is really fun to fly around the map. On top of that, the visuals are very polished, it's just great to look at. Despite not being able to finish it, I had a fun time playing it. Well done!