I appreciate how much effort you put into the tutorial. There is a lot of attention to detail in it, going as far as to program a tiny shake into the health bar when you mention it to make sure people look at it. It made the part of the game that usually sucks the most an actual highlight!
I was a bit more mixed on the actual main game. I think there were a lot of good decisions. I love how the enemies bump into each other, and I love that your bullets don't stop at one enemy, letting you slice through them. However, (and this might just be a me thing) I've always disliked the game feel of having to micromanage movement. And given the hurricane mechanic, I'm constantly micromanaging movement. I'm wondering if there is a way to keep your idea while minimizing the micromanagement of movement? Maybe making the hurricane smaller, but also giving you a little shield might work, so that you are fine to explore outside the eye for short periods of time without losing health, but insuring you have to go back in eventually?
Either way, I had fun! Cool game!