There are several good titles there
... likely you haven't heard about them or aren't your type but they are still good:
If you like VNs: Cho Dengeki Stryker. The longest one on Steam so far that you can buy(because Narcissu is free). "World End Economica 1" is good(Hasekura, the author of the light novels Spice and Wolf made this one too), but it is the first part of a trilogy that isn't completely translated yet(part 2 & 3 are WIP)... "Dysfunctional Systems: Learning to Manage Chaos" is not a japanese VN but it is still good, however it is also a part of a trilogy(part 2 & 3 are WIP).
If you like adventure games: Broken Sword: Director's Cut.
If you want to try something for the lulz: Atom Zombie Smasher.
If you like puzzle games: Fractal.
If you have Red Faction: Armageddon and do not have the Path to War DLC, then this one.