Well I could throwdown some really old references, but I also would like another Dungeon Keeper (ain't that old to me...) the list also includes.
Shining Force (Genisis) (I do not accept the newest on as being a real sequal)
Act Raiser (SNES) (If a studio is brave enough to get that much hatemail from any/all religion)
U.N. Squadron (SNES) (if not a sequal, a faithful update/recreation)
Zombies Ate My Neighbors (SNES) (could be a L4D/2 mod for all I care, but still fun idea)
Trauma Team (Wii) (I have no news on it's sequal, but I would like another game like it without 'just' being about surgery)
No More Heroes (Wii) (Give Travis Touchdown a reason, any reason, give his cat diarhea and BOOM he goes on another kill-spree)