Wow this is difficult but also really good! I like the progression of upgrades as well as the difficulty increasing as you progress further. The gameplay loop is so addicting that I spent nearly an hour trying to get to the end (as well as dying dozens of times).
My main criticism is that the difficulty is simply too high, you start with 5 HP which is easily depleted as multiple enemies show up, although it can be upgraded. Also, I found it easier to just cheese it by dashing straight to the bottom rather than trying to get upgrades and inevitably dying.
After beating the armada I'm not sure what to do. The devourer showed up and killed me instantly the first time. The second time, it got stuck inside of me which I think is a bug.
Ultimately, the game is a very unique and innovative take on space shooters and I did enjoy it enough to play as long as I did. If you were to change one thing to improve upon the game, I would say to just tweak the difficulty a bit because what you have already is really good. Well done!