If anyone wants to take a shot at making my co-op game idea, that'd be awesome. I still think it could use some refinement though.
-----------------------------------------------
Another idea:
A survival game, kind of like
Notrium, combined with a roguelike. Your character would have to sleep and eat, have a stamina bar, and react to temperatures. Also, day and night would pass realisticlly, and maybe even have seasons and weather patterns. A lot of this is inspired by DF's adventure mode.
Also, the game would display no number stats, instead you'd get descriptions like "fairly strong" or "quite slow". (again, inpspired by DF) This would add to the sense of immersion. Instead of seeing this when you buy a copper sword:
Copper sword
Cost: 5 GP
Damage: 4-6
Accuracy: 5
You'd see this:
This is a copper sword. It looks well crafted and strong. It seems light and easy to handle. "Ah," says the shopkeeper. "That'll be 5 gold pieces."
----------------------------------------------
See how much more interesting that would be?
Also, to break up the monotony of traveling long distances, there could be an "overland travel" mode. You'd still be forced to enter the regular mode when you have to sleep, confront enemies (or sneak by them), or pass diffcult obstacles like mountains. Like I said before, temperature would play a part too, you may have to light fires for warmth or find shade to keep cool.
Combat probably wouldn't be as in-depth as DF's, it would probably be more like Nethack. However, there would be a few twists-
1) The aforementioned stamina bar. This would decrease when you attack, sprint, or get hit. Carry a lot of heavy stuff would drain your stamina faster.
2) Blood loss. Small injuries will usually heal themselves over time, but large injuries would require your character to take medical action (like making a makeshift bandage) or risk losing even more health. Serious internal injuries would require a doctor to heal completely. Your character may also get scars, Fable-style, from serious wounds.
3) Stealth. The amount of light, any cover around you and the speed you're moving (normal, sprinting, or sneaking) would all effect an enemy's chance of spotting you.
------------------------------------
It's a long shot, but I would love to see a game like this.