In the Windows version you get most of the costumes, but not the pets. You can buy them though
I'm on the windows PC version but i STILL CANNOT FIND THOSE DAMN PETS! i've searched everywhere for the little dollar sign, i've searched on the main menu and the in game menu but i cannot find it.
Apparently Itch doesn't allow DLC.
You need to get the Steam version, which you get a key once your purchase it here for that.