@coolboymew Filters weren't that bad when I tried them with Link's Awakening DX. It honestly looked like a hand-drawn flash game. I guess it depends on the game.
@coolboymew This was years ago. Back when I was using VisualBoyAdvance which I don't use anymore. This Let's Play uses the same filters I used.
https://invidious.poast.org/watch?v=J--8oSQkj4k
Okay, it doesn't look as good as I remember, but the HUD sprites look smooth as fuck.