Sorry for the double post, only to announce that I uploaded the current version of the game. the link is on the first post, it's around 8mb, and I still haven't figure out how to fix the memory problem, so you'll need at least 128mb of free ram only for the game (I don't think it's a big problem anyway, just want to make it consume less)
a few notes to be taken:
1- the main menu options are chosen with the mouse, so click one of the difficulty levels to start a game
2- clicking load game without a save file will bring a game over screen, I'll try to fix that later, not a big problem
3- if the game is starting in the last save point instead of the title screen, try deleting the temp file in the folder
4- the current version only have 1 secret available, and no extra costumes for now
5- there's nothing done after the 4 bosses are defeated
6- I'm totally redesigning the boss of the top-left area, I was still learning GML there, you can see the progress of my learning thru the bosses, but that is for the final version only
any bugs or suggestions, post here, I'll be glad to help =)