Sorry for being so harsh in that comment. I guess my problems could be related to macOS build because I was playing it on a macbook. And that was why I found using function keys cumbersome, because you can't hold a laptop like a guitar :p
Overall this game is not so bad. If it had better music and better aligned notes it could be fun.
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On laptops, typically pressing the function keys requires you to press the Fn key. Otherwise, you're activating media keys. Again, didn't think about laptops when making this game. I'll probably add multiple default control set ups to accommodate for that.
The music was entirely improvised and meant to be pretty basic up until the end.