Why can't we equip the tesla gun? Make the gun dropoff for that be an instant screen clearer for two seconds. Something short enough to be useful but not insanely OP.
That's the way it's supposed to work. HINT: Just because you can hire more workers and soldiers doesn't mean you should. It's part of the balance of the game.
Win easily: Do nothing but use poison guys and once you can, upgrade that branch. I've been winning on Hard using nothing but poison guys. I've found you're better off adding a new one compared to upgrading one especially when you call early waves. Upgrade, of course, but I was already on mission four when I realized upgrading was possible.
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That's the way it's supposed to work. HINT: Just because you can hire more workers and soldiers doesn't mean you should. It's part of the balance of the game.