Way too punishing. I'm decent at platformers and have a pretty good patience for difficult games but I couldn't get past the first level of this. Bullet-hell platformers are really difficult because you only really have full control over one axis of movement. I think the platforming was cool and I liked the difficulty, but losing in one hit of damage and going all the way back to the start after you lose your hp is just wayyy too punishing. It's a shame because I really wanted to finish this.
Also loved the opening drawings and cutscene!