Needs some difficulty settings. You can get samurais with the first 5 places you conquer then just keep it rolling. Enemies don't always attack empty squares.
Should have more difficulty settings. To win all you have to do is stack all your people and use their ability after bombing away the enemies in front of them.
easy mode: research artillery tower as early as you can, buy one for every 4 waves, use all cash on research generators, unlock everything on third planet. after 3 artillery towers, built 2 tesla towers followed by two nuke silos (for bosses) game won
If you don't know if you can beat the next town, just put all of your money into goods. You won't lose any money if you lose. Then you can just sell your goods and repair your ships.
I have found that making a ton of miner ships basically wins you any round. Works very well against infected because of their low health. They die in one or two hits, but when you get about 150 of them on the screen, doesn't matter. You also get energy whenever they attack.
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Darn! any more info you can give us about what might've caused it?