Replace all "explosion_big_f*.bmp" files by simply using one image and making the actual image grow based on the framerate. Rename bigexplosions to growingexplosions. You now have to specify the max amount of frames when adding a growing explosion rather than this value being hardcoded to 7. Explosions of an enemy that just died are now starting in the center position of the enemy. Get rid of some unused, useless and/or commented out code. Update TODO.txt.