We're in a closed-testing period. We don't want to have a public demo that anyone can download - the game is too early for that. Instead, we're creating a small barrier (of having to add your email address to our subscription list) so only people who are really interested in this kind of game will bother to go to the effort. On a practical level, that's also how we ensure that each person gets one download code and we can retrieve it from the list for them when they ask (which does happen). Hopefully, the people who do play it are then also happy to provide feedback so we can improve the game. So far that's working out quite well. We have a really nice community on Discord who give interesting and thoughtful feedback and people also use the in-game feedback forms to tell us useful things and/or send bug reports. All of this is a big help in us trying to make a great game. We will transition to a public game at some point. Unsure when that is yet, but if you don't want to add your email to our list, you can follow the game on Itch or Steam to find out when it's a public download.
Cheers,
Shaz