I want a continuous procedurally generated turn-based X-Com-like. Give me a squad and a terrain treadmill loaded with enemies.
Move from fight to fight, replenishing supplies from the fallen and hidden caches, rescuing survivors, civilians, and reinforcements. Have vehicle sections or powerups. Call in an artillery barrage or an air strike if you get pinned down.
Get messages about artifacts or objectives, and have to make a call about which you pursue.
I call it Fireteam Endless