Would it be possible to put the source code online? Would be awesome to be able to get a look at how it's built and tweak it.
Some feedbacks :
- Add some keyboard buttons as additional inputs, the middle click can be bothersome to use.
- Add an option to disable/enable particles, sometimes they get in the way of recognizing the next shape.
- I know you're good with music, so if you are making a game where the rythme change, you might as well try to make an adaptative music that follows the new beat. I feel like this is the #1 experimental stuff to try out on this kind of project.