The idea is good, and using chain reaction is totally relevant, but personally I’m not a fan of the games where you watch the game will play your place.
If we take the example of "Plague Inc," which is on the same principle, I have possible actions while my illness develops and becomes more and more contagious and/or deadly. Outside, if I spend my 5 points from the beginning, I couldn’t do anything.
Afterwards, I invite you to keep working on it; you could really have an incredible result with not much more.
Can’t wait to see your next ideas