Can't exit on windows build, have to Alt+F4. Not sure if it's just me being old but feel like the difficulty could have been slightly lower. Having the indicator being optional is pretty good because I pretty much need to have that on 100%. The indicator will still show green if your ball is coming behind you, but the ball will still hit you regardless if it's behind you, so maybe change that to indicate danger somehow? Other than that, it's a fun little game, where's the boss rush part though.