Hey! So, gave it a fair shake. Got to about level 10.
I'm not really an expert at balancing things in rogue-likes, so I'll abstain from critique there, but it does feel like there's an absence of visual feedback in terms of how my health/shields are doing. Having to check at the bottom left corner every so often is distracting from all the action that's happening around my ship.
There's nothing that really tells me when my shields are taking a beating, or when the shields are being bypassed and my health is being damaged directly, or when my health is critically low. I don't know if this is something you'd want to fix with audio cues, like maybe increasingly worrying cracking sounds for the shield until a big shatter sound when it fully depletes, or maybe something more visual like a blueish sphere sphere around the ship that becomes increasingly cracked as it takes damage until it shatters. Or maybe you'd simply want to put radial bars around the ship that only appear when you're taking damage, like a red half-radial on the left and blue one on the right.
There were instances where my screen was flashing red for some reason on the fog stage, around level 8? But I had no idea why. My health and shields were high and there was nothing really on the map that was damaging me. To me, a red screen flash is sign that I'm taking critical damage or am in critical shape, so I wasn't too sure what that was about.
The music's awesome, if a bit too loud. The menu volume was fine but then you start the game and suddenly the music is obnoxiously loud.
The pink missile dudes are mega annoying. Maybe I'm just bad at these kinds of games but holy cow were they annoying. Like more annoying than any of the other enemies. I think it's the fact that the missiles just home in on you endlessly and go slightly faster than your ship.
All in all, a pretty cool experience. Not my kind of game, but I can tell you worked hard on this. There weren't any glaring bugs that I could tell from my short 10 minute stint.