A while ago I mentioned that the game kept taking up more and more space (hidden in the %temp% files, some at least) the longer I played, and I wasn't the only one experiencing it. I was wondering if that issue was Identified and rectified?
This issue was indeed present with version 0.4.91, and has been solved with 0.5.2. We used compressed assets, but the engine got a bit overzealous when it came to decompressing the assets into temp storage. If you are on an up-to-date Windows version, they will be automatically cleaned up after some time :)