This is Xenoraptor. It is a shmup where you start off with a space dragon armed with a gatling gun that fires 100 rounds a second.
It is a shmup where weapon upgrades include drill missiles. Which you can spray out 20 of at once. It has weapon customization-do you want to make your railgun fire drills? Sure. Explosions? Certainly. Do you want a gatling gun that fires radiation bullets because you think Warframe is a good guide to how many warcrimes you should commit per capita? You got it.
The game is 50% off on steam right now, and although I think it's not worth 15 bucks, it's definitely worth $7.50. If you're planning on purchasing something cheapish for the Steam Sale, this is a good bet.