Wow this is really great congratulation man, this is very nice to play.
Gameplay is very good, although I didn't understand the purpose of the colonist ship, it should be integrated in the gameplay, even in easy mode.
I think maybe the playing area could be a little bigger (to make the game more relaxed than it is now), also this could be a very good "relaxing" game if oonly you could make the levels last longer, maybe even include an option with infinite play (morphing songs maybe?) and less difficulty, some people like this kind of games for mental massage.
Once again I don't know how new the concept is (my historical game knowledge stops with the 16 bit consoles) but I think you could flesh out the game, polish it, put it on a nice page and try to gather ad revenue from it before someone steals the idea.