Fun game as always, but...
PLEASE, make exp gain instantaneous! Do you have any idea how frustrating it is to JUST make enough exp to get to the next level, only to explode WHILE the experience is accumulating from your last awesome combo?
It might also be worth it to consider instantly adding each chain's value while you're still in the air without having to touch down first.
Also, gunners and homers aren't worth buying; they fire upwards, which can stall your combos. I found I could get combos and chains in excess of 50 with just 10 bombers, 5 bouncers, and 10 miners, and it would've been even higher were it not for the time limit!