This idea can be really good, or really boring. If almost everything has a reaction, the game would be a lot more interesting. It would take a long time to program, though. It could be like car+human= CO2+plant=oxygen+human=CO2 in a cycle.
This game is horrible. If it were not for the badges I wouldn't ever have played for as long as I have. I could point out flaws, but the list would be too long and they have already been said. How this game got badges and is rated as high as it is astounds me.
I may be wrong, but I think when you speed up the game the rate at which the capsules on the ground releases enemies stays the same speed. In other words, they don't get out as fast. This is obnoxious...