I completed every main mission, unlocked all parts, gotten all achievements, and did many side quests in my 23hr before writing this review.
TLDR: Game is a very good robotic builder game, main loop is good but a bit repetitive, looking forward to more updates.

This game can be split into 3 types of missions.
1. Unique transit, these objects may have rules around them such as can't touch the ground (ice cream), time limits (ice), extremely awkward to move and deliver (wind turbine blade), etc. These missions are the peak of this game and are the ones you'll spend time creating unique rovers for. This game exceeds during these missions with fun memorable challenges.
2. Building missions, these missions offer a break from the standard transit loop, they build up the infrastructure and can greatly increase the ease of transiting objects in future, the main challenge is less of the building and more of the landscape and geography of mars, having to fly you rover over the cliffs and valleys trying to time your placement to get it just right can be a fun challenge to creating efficient placements, or you could just go around.
3. Filler transit, these are primary side quests that can be ignored, but you will have to complete a few of these to build up enough cash, or to unlock certain parts. They are okay. It gets repetitive and you'll soon have an everything rover capable of transiting 90% of objects with ease.

I can't speak to the multiplayer experience as I don't have friends, but this game does seem like it would lend itself well to it. I am looking forward to future updates as the game is fleshed out with more content. It is a must buy if its on sale, and if not I would still recommend it.

This game lets you make really cool cars