- Yes, it's standalone, as far as I know.
- Linux: idk tbh. you'll have to try it out. i don't have linux. send me an email if you want me to send you a copy of the empty generator to test.
- Yes, it's easy to just add new assets to the folders.
The generator's a bonus program included alongside the assets. The core of the pack is the PNG files, the generator works to make use of them.
Thanks