Stripped-down city builder Mini Settlers has a free prologue demo that seems perfect for Steam Deck
The high-fidelity rustic hurly-burly of Manor Lords is all very well, but some of us yearn for a simpler and perhaps, more elegant age, when city builders looked like a bunch of copulating squares, and could run on PCs with approximately the computing power of a slice of bread (toasted, but not buttered). Step forward Mini Settlers, which has a free prologue version you might try if you're weary of Manor Lording, or you've already exhausted the play possibilities of early access Franconia.