This game has to be the best thing I have played from NG in the past decade. I don't have any bugs when I play on the NG player but sometimes the game doesn't respond to some controls at points. But other than that the game is still pretty solid.
Info for people having some problems: Arena not backing out when you die is from when you play on the ruffle emulation as it can't play the game perfectly. The glitch to where it takes over buttons is maybe a problem with the keyboard or lag I haven't had that problem yet. The screen turning black or not loading if your playing on ruffle is because your computer might not be able to run the game on the emulator. That is all I know for problems and some of the fixes for it or reasons.