Love the concept, can't wait for updates!
If you're going to be adding more upgrades to buy with diamonds, a cost reducer for balls would be pretty nice.
Fun game, needs a save feature and cursor controls, maybe more upgrades (like for graphics and music) Pause could open up a separate menu for upgrades? Keep up the good work!
I do see a cool concept. Maybe you work on it and get it longer and a tad more complicated? Like going for the gun would put it in your inventory or whatever. Maybe you need to go for the knife and get it to stab the guy and take his gun. I dunno. 5*s :P
thanks for sharing your thoughts Ampjack :)