Masterpace is already an excelent little game and hopefully the developers will see fit to carry it forward.
While there are several modes, my favorite is the spherical planet with 3 other planets. You begin on a spherical planet, you can run round the enitre planet in 5-6 mins. As the sun goes round you can keep moving and stay in daylight all the time.
Currently the basic drive is to get culture points which are then spent on perks. Perks unlock additional resources and equipment ultimatly allowing you to build a spaceship and fly away to the other planets.
There is enough motivation here to make the game playable, and as Culture points are gained only by constructing buildings (which can be saved separatly and shared) it makes this more of an architectural/building game rather than a mining game. Thus the amount of game play you get is somewhat dependant on you liking building.
The building tools are adequate, they could be improved, but are very usable already.
There are a few hostile mobs on the planet, these are easily dispatched with the pickaxe and do not currently re-spawn, so you can continue building unhindered.
Terain forming spherical planets creates some interesting effects, both mining and re-depositing material. Even manufatured materials like steel can be used to teraform.
Be aware this is an alpha game so be prepaired to make a consierable amount of the fun up yourself.