Quick question, when you do a full install for an update, does it make a new application or does it replace the old one on your system?
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Sorry for getting back to you so late, unfortunately itch didn't notify me about your reply to this thread. :)
The game doesn't install anything on the system, after unzipping it's ready to run. It takes some space on windows drive for save games, global settings like keymapping, and world generation stuff, but other than that there is no registration in the system and simply removing the directory is enough to remove the game.