Bullet-hell platfomer is a really fun idea, but I think you've set the difficulty a bit high from the start.
With this shooting speed it's impossible to beat the first enemy before it starts spraying quickly, and at that point you can't move faster than the bullets. I only beat it eventually by getting really lucky with the dodges. Or maybe I'm just missing something, idk.
Anyway it's a neat concept, I'd love to see more!