Updated the starting post with version 1.1. Quite a few changes, most notable the viewing of world 3, graphic representations of all the objects on the maps, as well as the ability to export level, tiles and all graphics used in the game. It should also run slightly faster. Sadly there was not much unused information I could find. The only odd occurences are unknown objects in L4-1 (my guess is barriers that had to be destroyed) and some electricity bolts ("zap" graphic name) that were amongst the L1-2 fish graphics.
That's about all I can extract from the game. Enjoy!