I agree that Anomaly Warzone is working very well, also on tablet with Windows 8.1 by the way. It is in the Plants Vs. Zombies, tower defence category of games.
there is some good advetures you can play on tablets. most are from telltale games like back to the future, monkey island etc. but they are on Ipad i dont know if they are on Windows
i think can exist good dos emulators on windows 8.1 only you need to search a little... :)