The art is simple but expressive. Even though there were no clear explanations of the buildings, I could guess what they do based on the art.
Sometimes the buildings would not let you build on certain tiles. And it would be nice if there was a indication if your mouse was currently over an astronaut, as picking them up without always felt wrong and its hard to judge if you can pick them up atm.
Getting to the end was a bit tedious, but it never got too boring since I had to keep my astronauts at work! Great Game overall.