Great, but not for everybody.
I loved the game, I'm a self-made addict of bullet hell games. And not only am I addicted, I'm good too. I beat the entire game, and died under 20 times. I had every BHP, and I was never short on money. The graphics were great, the battles were intense, and kept me on edge trying to dodge everything coming at me. Don't worry very much if you get a few bad scores on bullet hell games like this, because these games aren't for everybody. Their intensity is by default absolutely insane, and most people have little tolerance for games meant to be this challenging. Compared to other bullet hell games I've played (lots of them), this has already made my top 10 favorites of all time. Congratulations dude, I really hope you make a sequel.
I did, however, find one glitch that made it possible to spam upgrades. If you go into the shop, you can buy the first listed BHP for 6000 gold, and sell it for 6256 gold, allowing players to buy and sell infinitely for as much profit as they desired. The second item you could apply this to, was the Ship Energy Injection (this one is actually alot faster to apply it to). You buy Ship Energy Injections for 4000 gold, but can sell this for 5266 gold. this allows for 25% profit every time you buy and sell one, allowing you to make several hundred thousand gold relatively quick. Please lower their selling price, or increase their buying price to eliminate the glitch. Overall, 10/10, 5/5.