Great game! I love the mechanics and systems. My biggest issue with it though, is the camera, which gets shaky when you hit and stops moving when you near the edges of a room. I think it's unfit for a bullet dodging game.
I suggest adding a warning to this game regarding hand and carpal tunnel injuries. I know it sounds ridicules, but repetitive hand motions from stroking squids can actually cause severe harm to an addicted idle player. Remember to stretch your hand and rest from time to time.
Stage 9 Challenge Mode made easy: Sawn-Off, Molotov, Mine.
Always fire Molotov or Mine with a double click. They'll trigger twice in the same location, and explode / melt the enemies instantly before they are able to regenerate. Do this only against clusters of enemies. Individual enemies that slip through your defense should be finished off with the Sawn-Off (If possible, let the individuals punch at you a little before other individuals join them so you can bomb them together). The key is to kill as many as possible with your Molotov and Mine bombardments. The Sawn-Off should be used mostly to knock back the enemies and herd them together.
It would be nice if you'd win when you own all planets on the map... I spend too much time chasing 50 enemy units from planet to planet with my army of 200...
Just a tip: After a gem is being grabbed for the first time, it kinda stops floating in the air and lays on the ground instead. This can help you know whether someone touched your gem or not, so you can get a Brilliant score.
It's funny how they file the "Critical" buff under the "Active" category considering how critical hits are basically the all-time cliche of skills that are passive.
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