Forgive my lack of knowledge, I literally just got this game Sunday, and I've been busy as hell all week, but it seems to me with cannons, a major problem is only affecting one block. Problem is, missiles already do a blast, so adding that to cannons is redundant and detracts from both. Why not make cannons punch through and hit some blocks in a line or a cone from the point of impact (shrapnel from the shell)? It handles the single block problem, while, still keeping it different.