Story is not gameplay. If you remove [the story] you remove the Gameplay.
Is it a Trainer Game, a Brothel Game, a RPG Combat Game, a Breeder Game?
I think I understand what you mean. Let me rephrase a bit.
Let's consider a Sandbox new game. It's basically uninteresting, because there's no challenge:
- there's little to no upkeep, or ways to go bankrupt even if you were to try. So no management challenge.
- setting up a dungeon squad is not that hard; you don't even need workers (or even buildings) since you'll eventually find everything you need in a dungeon, and more
- in case you don't want to set foot in the dungeon, the only thing to do is to build your manor. And there's little point in doing that, and no challenge involved since all ressources are readily available in any market.
- there's no punishment for doing everything wrong; you could stick a bunch of newbies in the brothel, and just skip days: you'll get to the same point as a hard-working optimisation freak.
- there's no reward for doing everything right; what your super dwarven blacksmith can craft, the clueless player can buy it in a store eventually (probably cheaper considering the time and effort spent training)
- economy in particular is awfully balanced, which is a cause for the last points. High-end products yield too little profit for your trouble, and raw materials should be treated differently.
Strive (and conquest) is ultimately story-driven. Once you're done with the story, there's not much to play with.
So it's a bit of "a Trainer Game, a Brothel Game, a RPG Combat Game". The issue being, the challenge is way too low for the game to remain interesting for long, with the story out of the picture.
To say that unkindly: it sucks as a sandbox game. Pytfall, in contrast, had unreasonably high challenges to overcome, and many mechanics which forced you to 'raise your slaves right' (aaand no story

).
Strive's a game you play for the story. If you find the current mechanics lacking (like I do), I recommend waiting for the full game instead of getting a negative opinion now. You might enjoy the game once there's a full story, many side-quests, to veil the weaknesses of the mechanics. I doubt it'll be a viable sandbox game, but at least you'll have many ways to get to the same goal.