Primarily due to the entirely different screen, but also other internal technical reasons, any flash applications or assembly/Axe programs designed for the regular 83+/84+ calculators will not work on the 84+CSE. Unfortunate, I know.
New programs and games are starting to be developed for the 84+CSE, though, and a few have been released. If you're looking for assembly games, perhaps you'll find something you like
here or
here?