Insane levels are very easy if you know what to do. Here are some tips.
For the last level with 300+ shapes, max out Circle and try to combust a few adjacent circles simultaneously - their combined explosion with activate everything else around them. Then just sit back and watch the fireworks.
For the previous mixed levels with less shapes, I found it was a good strategy to activate a single super circle at a time and then activate another super circle, weakened by the blast of the previous. Or if you are lucky to get 2 adjacent super circles you can get a megabomb and activate everything near them.
For the mixed level with the least number of shapes use maxed triangles and look for circles that will weaken super triangles.
finally got the hang of it. lvl 19 seems impossible for me, but the lag is even more impossible. Too much small detail on the collisions, please make a setting to remove them.
Upgrages carry on with you even if you die, but it is tedious starting from lvl 1 each time. You have the physics right, just add some more structures and projectiles. Maybe even multiplayer?
Very good idea and decent realisation. I like how the upgrades give you extra guns and rockets. Two major things to fix - 1. Make the gun auto fire or fire with keyboard and 2. Reduce lag, there are way too much particles
 "Use Boxmen"){kind=icon}
 "Polygonal Fury"){kind=icon}
 "Cargo Bridge"){kind=icon}
 "me and the key"){kind=icon}
 "Tower Defence"){kind=icon}
 "Super Energy Apocalypse : RECYCLED!"){kind=icon}
 "Global Defense System"){kind=icon}
 "Castle Clout 3.0"){kind=icon}
 "Earth Defense"){kind=icon}
 "Kingdom of Gold"){kind=icon}
 "The Codex of Alchemical Engineering"){kind=icon}
 "Whiflash"){kind=icon}
 "Kongai"){kind=icon}
 "Hunter Story"){kind=icon}
 "Warbears Adventures : An A.R. X-Mas"){kind=icon}
 "Flying Archer Dude"){kind=icon}
 "Rescue Under Fire"){kind=icon}
 "Noidzor 2"){kind=icon}