Steam – Are there any tools available to convert game save files from the GFWL to the Steam version

After a few tests, it seems that the slot() file mentionned hereabove contains the character's data (level, equipment, unlocks, etc.)

So if you play on two different computers, you just have to copy/paste this file at the right location: C:\Users\USERNAME\AppData\Local\Demiurge Studios\Shoot Many Robots\SOMEWEIRDINTEGER\

I don't think you'll be able to copy everything and have it work right away, since like others have mentioned there are probably some files that are different.

However, the bulk of what you download are things like music, textures, and models, and those will most likely be the same between platforms.

What you could try doing is downloading the game onto your macbook, copying everything onto your PC, and then telling steam on the PC to verify your game files. This runs a check over all of the files you have, and repairs anything different or missing. In theory, this will let you keep all of the big asset files, while only needing to download a few small ones to make the version correct.