In the menu, you see that item that looks like a tool box? You need one of them to change upgrade.
Ah, I assumed that was ammo for some weapon I didn't have. So long as it's something i can buy from the store with gold, then I'm set.
Now, onto another problem. In the Gallery-room where you can spawn monsters, how do you unlock them?
I'd assumed it was done by killing them and adding them to the computer-list-thing, but it doesn't look like it. I know 0 is the blue fly and 1 is the facehugger, and I have them unlocked on the computer terminal, but not in the room itself.
Also, on the complete save from earlier, that does have these things unlocked, is there a way to properly spawn them?
I mean, you can make them appear and by pressing up you can cycle through their animations, but is there a way to turn their AI back on and have them move and attack naturally?