Reminds me of Cannon Fodder :)
Some things to improve on:
List of Medals/ribbons,
Wave Count & Enemies Killed,
Grenades that seem to travel the whole map and take out a trenchful of soldiers,
Bunkers,
More comments on how each structure/item works,
Bazooka and grenade friendly fire.
Otherwise a good game :) 4/5
Really fast.....
I liked the upgrades, but the fast ships that shoot a stream of bullets make your worthwhile bubble collecting all for nothing in a few seconds....
BADGES!!