Ok this was certainly unique.. but I don't really see (ha) any unique bullets, but I guess them being invisible counts!
I'll be honest it's really hard for me to play something like this, and I'm not sure why. But it seems like you have Metafab integration. Since I have a bias towards the genre I won't comment further.
Edit: Also I forgot you should look into better ways of making an exe. AutoPyToExe for example has functionality so you don't need all these files and folders (Making it hard to find the .exe..) Just put your data folder in the same dir as the exe then. -Fellow snek