Sneak is a stealth pseudo-realtime roguelike. It was fun and I'll continue to play with it.
The guards have the standard patrol and alert states of stealth games, and it works well with the generated levels. Unlike many stealth games, the guards didn't seem to fall into predictable patterns, requiring frequent improvisation. And alerted guards—whether after spotting you or bodies left behind—become even more frenetic in their searches.
The pseudo-realtime worked well here with responsive and simple controls. The difficulty ramps up quickly, and guards can spawn facing the level start, but these issues don't diminish the fun.
Sneak (Löve, OS X, Windows) was developed by Spferical.