I love this game and I'm super envious of it.
Idea and execution are great. My only problem is on the level design and tutorial.
I'll put it bluntly, the level design it's horrible (lol):
Your level doesn't reward you for being good at the game. If you get good with walljump+parry you still can't climb the level with ease because your design seems against it. Even if you learn to hover and chain walljumps, every once in while there are sections that you can't climb(or void sections because an explosion destroyed a whole platform). And so if/when you fall, there is a "Getting over it" effect. Since everything is destroyed you must sit and shoot for a long while to raise your bulletsea.
This is a big problem because it's not fun to sit and wait to fill your pool.
Another compound problem is that if your game plan is to parry most enemies, the bulletsea won't rise at all, and so again the game punishes you if play well.
ihmo you need indestructible blocks(or at least some blocks with 4x health) to create a skeleton of platforms for your level. Also a bathtub for your bullets wold be nice, so you can cut downtime if you slip.
Tutorials on how to actually play the game are pretty much missing. So you can't really be mad at players/streamers when they play like shit. The new version you uploaded with a shielded enemy doesn't solve anything. It's not a tutorial, but a roadblock.
Don't give up this project because it's super good.