A friend that bought it told me it wasn't ready to buy yet, even after it got updated he said he still liked playing Rimworld because of its tactical combat.

Both rimworld and spacebase df9 are very early alpha, they are not really good purchases right now in my opinion. Spacebase you can only get a few (2-4) hours of gameplay out of, Rimworld has different randomizations which basically make the games different so it lasts a bit longer. But unlike spacebase, in rimworld you are constantly reminded of how a lot (most) of the content isn't in the game yet. Spacebase, at least, is polished for "what it is", about the same as a demo.

Also spacebase's devs are occupied with other projects and spacebase is their side-project. They have monthly updates but the ones I've seen so far sets a pretty low pace. Rimworld's guys are at least fully focused on that.

also i must say price for spacebase is pretty high imo but still dunno i find it less cool but more intriguing it seems there is  "a lot" of stuff and most of it working to be a alpha release, so im very interested in it

as for the pace dunno, starbase release nearly every month while rimworld its not clear their schedule i think it was all done by a single guy for the start then after the funding got some more ppl to help so maybe there isnt yet a schedule to follow maybe now theyll start releasing stuff regularly

also this is quite a point for rimworld too since a single guy could do so much shows initiative and some talent, probably now that he got help he can progress the game even more

Can't imagine it wasn't.