Pricing is still under question, we don't have a clear idea but most likely under $20 with reasonable regional pricing, at least in accordance with our knowledge.
We are developing the game with intention of as much of it eventually being moddable as possible down the line, but very likely it will require a Unity installation for most of it. There isn't much I can share at the moment though, we aren't actively working on implementation itself.
There will be a bunch, stuff that we like ourselves and stuff we aren't against being in the game. Not gonna name specifics, but our idea is it's a little progression systems with unlocks/totems that represent various fetishes being enabled or disabled.