Ok here is my take on this game. I liked the way this game plays out, but there are some elements that really annoyed me. First and foremost, the multiplayer aspect. Turn this into a single player game, get rid of the annoyingly long timers, scale the city contributions down so they are doable for one person, and this game would be a blast to play for me.
"Aim with mouse, click to shoot." doesn't tell you why more bubble keep getting added, what the goal is, what you are trying not to do, why there are faint bubbles at the top of the screen that keep going away, or much of anything else about the game mechanics. It needs proper instructions. I did not know the game was timed until it just ended without warning.
I had not completed all of the levels, or even upgraded my ship completely. Suddenly my ship accessories disappeared and I was left with only my coin catcher and 102% completion. WTF?