I primarily play on PC and don't have a problem with screen size. When I've played on the Deck I've found myself peering a bit at the smaller text, toolbars and item descriptions and so on, but it was all readable and my vision isn't exactly stellar. If the Retroid has a smaller screen than the Deck though, it's possible you could run into trouble there. I think the dev team has accounted for that with some UI size multipliers in the settings menu but I might be misremembering that. I'll check that tonight when I'm off work and I'll update here if I remember to.