As of today, all the RETREAM games are available for free download at
https://www.retream.com /
https://retream.itch.io. The store will not ask for any payment and it will not even be possible to make a donation to RETREAM. However, given the sad events that these days are devastating Ukraine (and the world), it would be nice if who downloads and likes the games also makes a donation (of any kind, in any way) for Ukraine.
Enjoy!