The paid games with no demo from ... less known developers on itch always baffle me.
Granted, not all people using itch know certain things about itch and steam. You can give back a game on steam within 2 hours, no questions asked. If you see an interesting game you can try. And all games sold on steam went through a painful process that costs 100 bucks upfront and has some kind of barrier that I do not know the specifics of, but devs asking for their game to be wishlisted on steam speaks volumes. You can't just release your stuff on steam.
On itch any hobby dev that manages to fill out the tax questions can "release" their paid games. That does not say those games are bad, but why release the game without a playable demo? Is the game so bad, that I would not buy, if I played the demo?
Yeah, I know, it is said that pay what you want often gives more money than paid, but the choice is the devloper's how to release the game. But I deem it publishing suicide to not release at least a demo if not a free public version on this platform. Know your audience! There are people (the majority I assume) that will not glance a first or second time at games with no free playable stuff.