Solid game. Short, no endgame. As soon as I had splitter, double damage, and all three stages arranging shrink magic splitter(buzzsaw makes a big difference) to abuse the high magic base damage and explosions and then to make full use of splitter on the third zone you can snowball almost too easily. I suspect as few as 3 shrinks are enough in the first zone, you want to stack as much magic as possible in the second, and a few splitters in the last to get the flow of big money going, especially with extra splits and jackpot.
I'm sitting as able to redeem 350 golden balls as I type this with all 3 stages fully upped, so this is basically where the game ends.
It would be interesting if you could use the same weapon on all 3 areas after "beating the game" if only to see what truly maxed splitter cashflow looks like.