I have been playing RimWorld since very early alpha, about 2 years now. This is the best colony simulator I have ever played, and I have played them all up to now.
If you are worried about this being Alpha, don’t be. The game is updated regularly and with tons of new cool features every time. Also the modding community is massive and the game changes dramatically (harder / easier, more realistic / hundreds of new options) whichever you prefer based on what mods you use. Before Steam release I used about 30 mods, and they work well together. I imagine modding will be even better (if possible) on steam.
Graphics are awesome (kind of like Prison Architect) gameplay is incredible and depth of immersion is fantastic.
I can’t give this game less than a 10 out of 10.
If you love colony type games (DF, Gnomoria, etc…) You will love RimWorld! Buy it now! You will not be burned by ‘early access’ on this one. The game is already 100% playable.