i just got 5 stars on insane death match, and what i have to say is Captains are better than Generals, (more hp) captains can last 20% longer than generals which makes it easier to get the the enemy base here is the build i found best: 5 Himonk, 5 cannon, 5 captain. heres the technique: defend your base (when your units are summoned press defend) when the enemy is almost at your base press attack, you will slaughter them, and when you see them popping low units, attack them, it should take a couple minutes to get to their base but with captains taking more hits and the monks healing them quickly you should have no problem, Cannons really help support the captains, if you have too many melee units then it will be very difficult to get to the enemy base. it took me 3 waves to defeat them, and a couple times i had to rush some low level units out cause my base was being attacked. so it might be easier to retreat your cannons, monks and some captains.
as long as the ninja spawns in the top, you will win guaranteed, almost, he has to be froze for an ez win, build 4 crypts in the top left high ground, and 3 directly behind it. with 4 towers with max freeze that 100% chance to freeze, well supposedly, there is a chance you wont freeze him but you have a high chance to stun him and the towers can still attack if he gets stunned. go up there with your meteor(predict this, also do this in slow mode) and let 'em rip!