We've been giving out the Kickstarter backer codes via Humble Store and it's in a different category than your KS tier (since there are different versions of the game independent of tiers) so it's easy to miss. It's also possible that we missed a few backers and there were also a handful of backers who didn't fill out their reward survey on what version they wanted.
Hmmm see that I purchased the game but clicking the link gives me this page.
I'm pretty sure I messaged y'all that I wanted to switch to ps4 version, but I've not gotten a code.
Don't see the game on my dl page.