Well I've managed to fix quite a few of the major bugs that were in the game. Trash cans no longer inexplicably hit invisible walls after being thrown, and characters no longer have strange drawing errors when holding objects.

The other thing I've been doing is working on the level format:


Now I can pass as many background images to the background object as I want, and it will string them together into a single level. Enemies don't activate until they appear on screen. Of course, now I have to split the level into sections, with the player having to beat a certain amount of enemies before progressing. This also means making sure enemies don't go to an area the player has passed in order to search for objects to throw.