Hi!
It's a pretty good game. I had a lot of fun playing it.
The changing colors with were a nice touch. The BGM was pretty good and suited the gameplay very much!
However, there are some things that could be made better. The enemies many times kill themselves with their own shots before I could even see them. The mouse sensitivity was also a bit too much and I pressed every single button, yet I couldn't find the pause menu to change the settings.