how do i buy the OST

I'm trying to beat The Sunken City doing 100% but I can't find a single last Fracture, I'm always ending with 99/100, I found all secret areas that we can go inside by walking through wall and by breaking the wall/window. Any idea where's the last Fracture?...

I'm not so good at 2d games, so I'm asking.

Did the Linux build get removed? The Windows executables only are downloaded.

-Please have a way to retry the boss rush, normally if you press "quit mission" it will send you all the way back to the top part of the ship, this wouldn't be a big deal except for the following point: -Not sure if this is a bug or not , but when you die in the boss rush you don't get your health back, sometimes you start with 1 HP or with half HP, would be nice to have health picks ups right at the beginning of the boss rush. -Maybe it's a bit too rough that there's no health pick ups between Bosses, i...