Mega Man is very playable, platform games which have a status bar like castlevania, faxanadu, battle of olympos etc doesn't work very well but they are full playable. All games that use a supported mapper should work if it doesn't rely on very accurate timing. Iam going to rewrite the PPU as soon as I got time and this will solve all glitchy graphics in those games Ive mentioned + I'll be able to support more advanced mappers.