hm downvoted by some lvl 25 noob who only posts pictures of flowers...odd
answered my own question, can get alpha builds on TPB:
https://thepiratebay.bid/torrent/17707131/RimWorld_(Alpha_17)
hmm not sure if that 's still up:
Looks like at least one:
https://thepiratebay.bid/s/?q=rimworld&apps=on&category=0&page=0&orderby=99
As always when you're not broke, don't pirate :)