Took some time to grok what's happening. It's a rough prototype but I feel there's a great idea in there. 

The main problem is that movement is not intuitive. It's hard to predict where things will end at the next turn because they slide along the squares of different size. On top of that they shift to the other side when pushed out of screen.

I think you should try to make another prototype with the same premise but ditch the tiled/tetris representation and use actual orbits and full 360 degrees view from planets when scanning for constellations (instead of only 4 direction). Something like that could be worth exploring and it's not that hard to implement.

Didn't really understand what to do at first so my score got extremely negative, kind of figured it out eventually but I think it's still very confusing.

Love the idea for this game. Almost want to get started making my own version now 😄. The biggest problem for me is that it’s hard to tell what gets affected by clicking which star, so maybe a small indicator on hover would be nice. What would also help is an indicator of what “constellation” the planet sees at the moment.