Awesome work, I love the way the core mechanic feeds into itself. Dash through bullets -> shoot -> lose health -> dash through bullets -> repeat, it’s really elegant. I also love how the mechanic rewards you for playing hyper aggressively, trying to dash through the most bullets possible per dash.
On that note, the final boss was especially cool, since instead of flooding you with bullets (which would have been simple to dash through and regain health), it gives you only sparse, specific lines of bullets. As a result, you’re forced to be very careful with your dashes to maximise the number of bullets you dash through. It was a really cool expansion on your core mechanic.
Also the soundtrack and art are both great! Nice job!