Thanks for the feedback, it's much appreciated! The controls have been mentioned and I'm just now realizing they 're uncomfortable. I'll be working on that for the next demo. The suggestions you made are good, as well, so thanks for that.
I'm super interested in the dash i-frames -- I had that early on in the game but turned it off as it made things a bit too easy. But I can see it being needed if the game goes in the direction of the boss fight, with more chaotic patterns, etc. Will experiment with that as well.
Dashing into the boss is a bug, so that's on the list to be fixed as well, thanks for mentioning. The red AoE and homing bullets pattern is done on purpose. I wanted the attack to feel chaotic, like the boss is throwing everything at you as it dies, but without i-frames on the dash, I can see how it could be a pain to avoid.
Thanks for playing the game and the detailed feedback!