Feedback: better movement. Having a delay of 100 means that sometimes you'll press a key and then release it while the delay is going on, so the key is never registered. To fix, reduce the delay and add a "cooldown" to movement. Create a timer for each player's actions. Every time he does something, set that timer to Time.Elapsed. The if statement (if keys (KEY_UP_ARROW) for example) should also include if Time.Elapsed > timer + 100 (or whatever cooldown time you want).
As for your actual question: could you explain a little bit about your array, "stuff". It's a pretty bad name for an array, but I think I understand that stuff is the array that represents all the puke-yellow circles. But, why is it a 2D array, and what does a value of 1 mean? Or anyother values that it might get.
I'd love to help, but I don't want to have to analyze your entire code. We're all very busy
-Cervantes
? Other than that pretty cool, just fix all the problems with the bombable circles and it should be fine. the bad part is that you can actually walk over the bombs...