SUPPORT
Bugs are reported on Discord, not by email: that way you can see whether yours is already reported and where it stands, instead of writing to a mailbox and waiting.
WHAT TO ATTACH
Game version, operating system, what you were doing right before, and the save file if the bug left it broken.
CHECK FIRST
Search the channel before opening a thread. If your bug is already reported, join that one instead of opening another.
REFUNDS
Handled by the store you bought from. On Steam: under 2 hours played and within 14 days of purchase.