It is not free on steam.
Edit: It's even got less stuff than this version, so for the price it's at right now, it is overpriced.
lol idiot be lucky it isn't 20$ to 40$ like most unfinished games are on steam also it's not overpriced since it actually makes sense for it to be 10$ since it's being constantly worked on meanwhile the free version isn't since it's pretty much abandoned so eventually it's gonna have more features than this. (also I think the free version is broken anyway so it's worth buying the current one since it supports the developers.).