I have many ideas, but one of my dream games I like to focus on is a camp counselor simulation set at Camp Crystal Lake. It's sort of like the Friday the 13th NES game, but works.
I think the main draw for me is the idea of this huge world, with just you and this massive stalker chasing each other around. I like to imagine Crystal Lake rendered as a beautiful natural landscape with a real time night & day cycle, weather effects, and an entire ecosystem thriving in the waters and forest. Recognizable locations from the movies would be peppered throughout the surrounding area, with the titular lake of course being in the center.
You would only have so many teens to burn through, and only so much time to stop Jason before he kills everyone. Since he's indestructible, you have to find a creative way to stop him and no one thing is ever guaranteed to keep him down for long. In the end, you will always die but the objective is to last as long as possible with the fewest casualties.
Each time Jason is defeated he reawakens, stronger & angrier at you than before. Every object can be interacted with in a fully realized fashion, allowing for the creation of traps. Jason may be retarded, but he isn't stupid! So he would also be creating weapons and traps for you and the other counselors.
There would be a scoring system in place tallied by survival time, # of rescues, % of damage done to Jason, and victories over him resulting in hibernation. As well, countless trophies awarded for creative thinking.
In sticking with tradition, your counselor will lose his/her clothes

For difficulties sake I would split the game into hours, and you would checkpoint only twice per hour of survival. No whining! If you survive through exactly 24 hours of gameplay (It always begins at midnight, on Friday the 13th) then you will 'win' by earning the title of 'Last Girl' and unlock Jason mode, the 2nd half of the game wherein the objective is pretty much self explanatory. It would be an amazing award to suddenly empower the player after having to gruel through literally 24 hours of extremely difficult fight or flight. I'd try to balance it out to where it would be possible to put him down once an hour, but by the 24th hour he would be in that ridiculous mode where no matter how far or fast you run he's right behind you or just ahead. I wouldn't forget Pamela either, a third mode starring her would basically be Hard difficulty for Jason mode, since she can only die once.
I think the tagline would be 'One life. One enemy. No chance.'
Now, what is your dream game?
