I realize that you guys plan on adding circle and pixel by pixel collision detection, but it would be nice if we could also have rotated bounding box collision (through a bounds_angle variable or something), as it would open up room to make rectangular objects (like a missile) move diagonally or in some other non-cardinal direction with more accurate collision detection. Also, another thing that would be nice is if we could mix and match various shapes of objects. We could define the shape of our object using some sort of bounds_shape variable that takes defined values like CIRCLE, BOX, ROTATED BOX, etc. This would open up options like creating an air hockey game or something where you have circular objects contained within set boundaries.