Very cool gameplay! Takes a lot of accuracy to shoot long range, but it's really satisfying. I love how fast the attack speed is right from the start!
Difficulty wise, I felt like I was breezing through. If I just rushed the spawns, I could kill them and heal up from the tomes faster than I'd take damage, so I was at like 400+ hp and rising, even though I wasn't being very careful. Felt great at first, but then felt like I might never die! Just keep tanking :D
Nice job, cool patterns and very much BULLET HELL indeed. My whole screen was covered! Nice soundtrack too.