I stopped production of the platformer, because after finishing the engine I realized I know nothing of side-scroller AI or XML sockets. Instead I'm starting production on a top-view shooter. I'm confident this one will be completed because it's so simple. I've finished the movement engine, I've got enemies planned, and interface design is easy. I'm just concerned that my controller scheme will ruin the game. Here is the movement engine, so make any suggestions for it.