I really wonder how is it possible that there's no demo yet. I'm not a game developer but i work at programming and i had made some shitty games both in unity and in godot as a hobby. And looking at all the sprites they have and how simple is this game when it comes to game mechanics, it just doesn't make any sense.
Maybe they talked about it and I'm not well informed, but either it's a scam as a lot of people say, trying to get money from donors or something similar or it is actually being done but their devs are rather new at the engine or coding in general. If this was the case I wish they talked more, I'm pretty sure that more than one on this site would be willing and could answer or give advice if they had found some type of wall they can't overcome.