There Can Be Only One/Strategies

Alfex's Strategy.
Buy a dart monkey and put it on the first circle. Sell it at the end of round 2 (you'll leak 6 bloons). Buy a spike factory, put it at the end of the track, upgrade it to bigger stacks. Buy a banana farm, upgrade it to more bananas. Buy a glue gunner, put it in the center of the moon, upgrade it to stickier glue, glue soak, and corrosive glue, upgrade the banana farm to banana plantation. Upgrade the spike factory to faster and even faster production, upgrade the banana farm to banana republic. Buy a monkey village, put it behind the glue gunner, upgrade the glue gunner to glue splatter, upgrade the banana farm to long life bananas and valuable bananas, upgrade the monkey village to monkey fort and radar scanner*, upgrade the glue gunner to bloon dissolver. Buy a super monkey, upgrade it to super and epic range, upgrade the monkey village to monkey beacon and jungle drums. Buy a bomb tower beside the glue gunner, upgrade it to extra range, frag bombs, and until moab mauler, upgrade the super monkey to laser and plasma blasts. Upgrade the monkey village to monkey town, upgrade the bomb tower to moab assassin, upgrade the spike factory to spiked ball factory, upgrade the banana farm to banana research facility, upgrade the super monkey to robo monkey (I used the moab assassin ability on the first bfb, but i'm not sure if I needed it), upgrade the monkey town to high energy beacon. Upgrade the robo monkey to technological terror, upgrade the spiked ball factory to spiked mines, buy a monkey ace, put it beside the tecnological terror, set it to path O, upgrade it to spy plane and spectre. After that, you can do what you want (if you buy a sniper monkey and upgrade it to cripple MOAB, the ZOMG won't get past the first circle).

.*I died around here, even with Healthy Bananas premium upgrade. This may need to be updated due to price changes.

(fixed)

Buy a dart monkey and put it on the first circle. Sell it at the end of round 2 (you'll leak 6-7 bloons). Buy a spike factory, put it at the end of the track, upgrade it to bigger stacks. Buy a banana farm, upgrade it to more bananas. Buy a glue gunner, put it in the center of the moon, upgrade it to stickier glue, glue soak, and corrosive glue, upgrade the banana farm to banana plantation. Upgrade the spike factory to faster and even faster production, upgrade the banana farm to banana republic. Buy a monkey village, put it behind the glue gunner, upgrade the glue gunner to glue splatter, upgrade the banana farm to long life bananas and valuable bananas, upgrade the glue gunner to bloon dissolver. Buy a super monkey, upgrade it to super and epic range. Upgrade the monkey village to monkey fort and radar scanner, upgrade the monkey village to monkey beacon and jungle drums. Buy a bomb tower beside the glue gunner, upgrade it to extra range, frag bombs, and until moab mauler, upgrade the super monkey to laser and plasma blasts. Upgrade the monkey village to monkey town, upgrade the bomb tower to moab assassin, upgrade the spike factory to spiked ball factory, upgrade the banana farm to banana research facility, upgrade the super monkey to robo monkey (I used the moab assassin ability on the first bfb, but i'm not sure if I needed it), upgrade the monkey town to high energy beacon. Upgrade the robo monkey to technological terror, upgrade the spiked ball factory to spiked mines, buy a monkey ace, put it beside the tecnological terror, set it to path O, upgrade it to spy plane and spectre. After that, you can do what you want (if you buy a sniper monkey and upgrade it to cripple MOAB, the ZOMG won't get past the first circle).

DVSA's Stragety
Buy a tack shooter, upgrade 3-2. Then, buy a spike factory, upgrade 3-2. Then, save enough for a 2-2 dartling gun, upgrade tack shooter to 4-2, upgrade to laser cannon, and have spiked mines by round 50. It is a good idea to have spikes r us, although you might need to add road spikes at some rounds. After round 50, you can sell some stuff and possibly get a 2-3 robo monkey or sun god. It is reccommended to have a camo detection village, since the mines does have its weaknesses when many ceramic camos come. By rounds 70-75, you should be all set.