Here's a copy of the system folder with the save files that should have the entire gallery unlocked. Fair warning: Trying to run the game without the savedata.dat file will crash the game on start-up, and trying to load a save without the corresponding slot's save#.dat file will crash the game then. The game apparently doesn't really create the files itself if they're missing, treating them as essential.
Keep a backup copy of your own system folder somewhere or re-download the game to get a clean copy if you ever want to reset, since there doesn't seem to be any other way to clear the save data that wouldn't involve a hex editor and figuring out the *.dat files' structures.
@RvWCaboose, I'm sorry that no one thus far seems to know how to really help you with your resolution issues, or how to help with the fact that the game's got an always-detecting-input-as-if-in-focus custom cursor. Take solace in the fact that everyone who has successfully played the game is pretty much in agreement that the game's content is pretty darn lacking, so you're not really missing out on much.