All of my games are available to everyone for free.
However, if you enjoyed any of my games, a couple of bucks to cover website hosting costs and support my ongoing efforts would be gratefully appreciated. I think $2 per game enjoyed is a fair price. Thanks.
Dropbox (250MB Extra space)
Penzu (20% off yearly subscription)
Hole in the Wall Hosting ($10US per year for 300mb space, 30gb bandwidth)

Hrm.. I wonder how much you could do with this... There are 2 ways I see it can be done..
1. You fail the mission due to something, but then you can go back and 'intervene' maybe with the AI controlling your previous character.
2. Future missions depend on your actions in previous missions, and you see 'shadows' of what your future self may be like early in the game. (So all scripted.)