itch.io

milodr use your hammer and RMB and click on the bottom "green +". I am playing the steam version now so I don't know if is like that on the itch version as I didn't really play it long. 

you didn't buy it though guys it was a donation. You had the choice to pay nothing... and how can they gauge how much/little people did donate? They can't go giving copies away to people who paid 10c. But I think they should give keys to anyone who donated 5 dollars or more and anyone else should get a 20% off voucher or something.

I'd like to know too. I donated for Raft a year ago but i see it is now on Steam for £15