Holy majeebus the last board is a shock. Not a difficulty ramp so much as a difficulty wall. Like you were designing the levels after you had the level select art down. "Crap, I can't scroll it, so I'll just put level 20 as the last one."
Why are people complaining about no saves? Came back even after restarting computer, and I'm back on the fourth board. Make sure you have Flash set to allow local saving in the right click menu.
Can't get a 5 since it is just a two minute tech demo, but what a tech! Awesome lighting system. And the shadow claws were entirely spooky. Couldn't hurt to put more of a clue on where to go though. Like a "Help!" at the side of the screen. Tiny map, but still unclear on where to go.
This is a good engine for a game, even if the game is as hard as Jello. But if you make it hard (as in make it so you need to do anything besides tech and cash missions), you'd need to improve the game system feedback. Like each nation should have a graph for... whatever it is that the other missions are supposed to accomplish. And a bar on the side that shows a logarithmic increase in attacking force so you actually need to evacuate the base. Oh, and it needs a Delpoy All button. Clicking Deploy 30 times is lame.
Actually pretty cool, if basic. Weapons need balancing though. Second one is better than next two. And bullet collision on your tank when you are rotated at a funny angle isn't perfect.
 "Cell Warfare"){kind=icon}
 "Ultimate Crab Battle"){kind=icon}
 "Bang, Boom, Splat!"){kind=icon}
 "English Pub Pool - B4"){kind=icon}
 "The Space Game"){kind=icon}
 "Hero RPG"){kind=icon}
 "Roly-Poly Cannon"){kind=icon}
 "Time4Cat"){kind=icon}
 "Neverending Light"){kind=icon}
 "Mastermind: World Conquerer"){kind=icon}
 "Metal Arena 2"){kind=icon}
 "Super Stacker 2"){kind=icon}
 "Death Dice Overdose"){kind=icon}
 "Elite Base Jump"){kind=icon}
 "Shock Arena"){kind=icon}