I haven't played Cities Skylines on the Deck, but other mouse + some keyboard management games (Victoria, Crusader Kings, Hearts of Iron 4 (to a lesser extent),

I haven't played Cities Skylines on the Deck, but other mouse + some keyboard management games (Victoria, Crusader Kings, Hearts of Iron 4 (to a lesser extent), Football Manager) are perfectly fine. It takes some adjustment to get the proper layout that makes sense with any shortcuts you might want (e.g. pause, adjust speed, open this or that menu) but they work perfectly fine.