It can be either control, which again makes bonuses a bit harder to hold on to, as whoever has a control will be going for those letters, similarly with start, and some of the overlap buttons...
I'll look at colours and see what I can do, might have to cut back to the original map and restart, but now that I'm getting the hang of this that shouldn't take -too- long (tho again, this is a slow process now I'm back at work

)
I'll have a version with more "apt" colours out in a little while... (possibly closer to "while" than "little")
Gameplay wise, I agree oak, it's going to be hard to get a feel for the balance until it's been played a few times and some criticism recieved. I've followed a consistent formula tho, so if it's unfair, it'll be consistently unfair

and we can look to revise that as it hopefully moves forwards.