I opened up Steam to see if any games were calling out to be played, and realized I bought AseSprite at some point, and it also became available on Linux (via Proton, I assume, as it's wrapped in a Windows looking window). But, I can't figure it out? It's complicated and clearly not designed for retro machine targets, though I've seen people talk about using it for making C64 sprites, I just can't see how. I reckon I'll keep plodding along with my editor that does only/exactly what I want.