This is free early prototype/demo of commercial game Raft. The full game is currently in Early Access on Steam:
Raft never had kickstarter or other crowd funding campaign. It was originally a school/hobby project by 3 Swedish university students during their final year in the university in 2016 - 2017. It became so popular that the three decided to turn it into a commercial game after graduation.
Plenty of people have copied the concept since, especially on mobile, but this is the original prototype that started it all.