No, they're not the dev. That would be Nomaaaaa, and they have it here (including mentioning that they wouldn't put it on itch).
https://img1.aryion.com/forum/viewtopic.php?f=79&t=60914&sid=5dc69af617cba6e7f69...
Also the version this guy showcased is outdated. Current public version is 1.20, and their Patreon is a bit further but it's just some patches for the most part.