Maia shows promise, although in the way of being so little more than a bare-bones engine, that anything is possible in the end. It could be that (judging by the progress speed that makes continental drift seem fast) in half a decade it will evolve into the most amazing colony sim ever. Or not. Who knows?
But at the moment, it's NOT a good use of your money. As was said, it pushes the limit of what is acceptable to release as "early access". It's just a bare-bones graphics engine, with some minimal and BROKEN animations, a non-functional AI, and no save and reload either, so your progress WILL be lost each time you exit.
And by "non-functional AI" I don't mean "might not prioritize right", but as in "doesn't even work, or not for long." Colonist AI routinely craps itself and either stops building anything any more (lucky version) or you just get a colonist going catatonic in the airlock and never moving any more (more usual version.) And when you do get it to work for half an hour, it will prioritize the hilariously wrong thing, like everyone keeping repairing the doors instead of building the air purifier.
Now that might be palatable (not really) in a game where you can direct them around, like in The Sims, and the AI only keeps them alive in between. But here you can't direct them, and the WHOLE premise is that they do their own thing, a broken AI just means a broken game.
Really, it has no excuse to be released at this early and dysfunctional stage. It may eventually be worth playing. Save your money for then.
Update for 0.44:
Upon starting the game, I proceeded to place the workshop and dig a small tunnel to one side, and a 4x4 tile hole there. Partially because you NEED minerals, and partially because I needed somewhere to place the hydroponics bay. I must stress that I wasn't digging some grand ballroom hall, and I was mindful that it has plenty of all rock walls on all sides, because I did read the update notes about earthquakes. When that was about half-way dug, the ceiling promptly collapsed, squashing the only digger robot and two of four colonists, who were there to take minerals.
So basically, instead of fixing the existing problems, it just added a random "*BANG* you're dead!" event, the hallmark of incompetent game design. Yippee.
Well, regardless of how you personally feel about that kind of events, to my mind it just further illustrated the point of why shouldn't you buy a game that's not even in alpha yet: you don't know what you're going to get for your money. The kind of gameplay elements that the final mix will have can just as well be what you like, or what you hate, and there's no way to know which it will be, as there doesn't even seem to be any plan.