There should be a final weapon for maybe 100,000 coins called the "Ban-Hammer". I have about 100,000 coins and everything else is maxed, so they will go to waste. An epic weapon for a lot of money would be great!
Two things you did right: 1) A puzzle game that doesn't have 64 or more levels. Exorbis 2 has 100 freaking levels. That's too many, especially for puzzle games, which get repetitive. 2) You had 30+ levels, but they were split-up into different maps. Good choice. Now, the things you did wrong: Lazy control scheme. It gets old, very, very quickly. There's also no mute button. Games without mute is like hamburgers without cheese: It's not the end of the world, but is it ever freaking annoying.
SHIFT: Forging new ground with a brilliant new concept! 5/5
SHIFT 2: More of the same! Not a bad thing, but not a whole lot to be a sequel. 4/5
SHIFT 3: Another one? And still the same? Okay, an auto-save feature and some new stuff in it, but still... 3/5
SHIFT 4: AGAIN!? C'mon, try a new concept already! 2/5
It's incomprehensibly bad! The last boss is nearly impossible because of incosistency! It fires FAR too many bombs when you're up in the air, and then the lasers keep you from getting close enough to do any freaking thing! It's horrible! I cannot express with words how BAD this game is. And I thought _I Love Traffic_ was pretty bad. Gosh.
The IndestructoTank. Invincible to bombs, guns, nukes, laser beams, and more. However, it explodes when it runs out of fuel. You can drop it incredible distances as long as it doesn't fall in any sort of pit, ditch, hole, cavern, canyon, or like. Then it will explode. Starting at $1,999,999.99. Free with a purchase of 10,000 iPads.