Very cool shoot 'em up, it's not retro like many others, but instead has a pretty modern look and feel, with the mouse controls and all. It's not that wacky kind of shmup, but very good amount of imagination has gone into the design of the enemies and other stuff you come across. I found it surprisingly easy at the beginning, not a bullet hell right from the start or anything.
If you're interested, you could enter our annual Game Development World Championship!