(the zip contains all of the other loose files in the folder)
The official translation for this is really poor, so I'd like to revise it and repack it if possible. I thought it might be a GameMaker file since it looks like a GM game (and the dev tweets about GM a lot), but the tool I tried didn't work. You can see some folders and files clearly, so I'm hoping that this is just a simple archive with some obfuscation or whatever. Let me know what you think. Thanks.
Edit: I did some digging, and it appears to be a Shooting Game Builder format. I'll play around with it later.