I've upgraded max shots to 34 and auto-fire to 12.1/sec but under my 'extra stats' the max amount of shots at any one time will not exceed 25-27? What is the point of upgrading max shots when I'm limited by the game?
You buy the First upgrade in the Upgrades screen. Then creeps will start dropping them. After that any further upgrades will improve the chance of finding shards by a lot.
Even when maxed on all upgrades can't defeat lvl 34 armored enemy with max spawner and max spawn speed. With laser turrets fully upgraded we should be able to defeat everything.
Ok, I balanced it out a little more. Also added "saving".