Yes! to see what little we have of the 3rd boss, SKIP the dragon boss ( don't interact with it's crystal) and when you go into the final room, the 3rd boss's crystal should be there! Yep, it's all really a matter of execution, isn't it? :] was going to have the dungeon rooms start to glitch out a little bit too( alongside character dialogue) to set up for the unholy dragon fight.
Well a gb rom might be a bit of a stretch but we will let you know when the polished version is out! it was developed in fusion; but we do have ideas of porting what we can to gbstudio; the biggest thing we'd have to nix is the "mode 7" style airship travel, although it could be replaced with something "shmupy" perhaps.