Trigun + Fooly Cooly = Gunbot?
My advice is only buy what you need.
Only buy the laser guns they all you need the other guns sucks.
Avenger and Chaos all you need =)
Chaos is the best cash weapon you can buy.
For shields buy the ones with the most cash bonus.
Also buy the most expensive gun & shields available to unlock the other equipment fast.
That robot reminds of the robot from Fooly Cooly!
I wish I could had buy Executioner... But I don't want to spend real money on a flash game and I don't popular in facebook....
I have 230 diamonds after finishing the game.