The gene seed is still around, so I’d guess so. A common feature of the gene seeds is that a lot of astartes takes on the visual traits of their primarch. You see this mentioned a lot with some other legions, like for example the blood angels having faces resembling Sanginius.

But a lot of the traitor space marines resent Horus for failing during the heresy, so guess it isn’t brought up much.

They only intend to fund development for a year with this kickstarter, and try to get a publisher on board once they’ve shown there is interest. That information should’ve been closer to the top though, a bit buried down there.

From the site:

We do want to make it clear, however, that our aim with your pledges is to fund full-time development for one year in order to produce an early access build. We would release this early access build to the appropriate backers and take feedback as we continue to release updates. We also aim to take this early access build to publishers to seek further funding, with the goal of completing the entire game.