First off, thank you so much for taking the time to write this critique. I'm still working on the project (it's a delight to work on and I have tons of ideas), and that kind of comment is super valuable. I do have some questions though.
Hitting a target lowers the score, and then the next target, if its timer runs out, increases the score once. There is actually no way to regress back multiple times like in your exemple, from 7 to 10... Unless I've missed a bug somewhere? But honestly I don't feel like I would have missed a detail that obvious and important.
Increasing the timer and making it stricter as your score lowers down is a good idea. I like that.
As for the fullscreen issue. What is your monitor size? I'll have to fix that up for sure.
