The basic bomb will be good for suicidal enemies.
Use freeze bomb to slow enemy movement and then use push to push them back more effectively
The basic bomb is also good against enemy shooters
Have two layers of mage, the front row use melee and the backrow use push/firing
Would be cool if the tanks do actually move about. And maybe have option to play as the anti-air unit. In fact could make a multiplayer with players able to choose to be the helo or the anti-air units.
A good tactic would be to open your sonar for about 5-7 sweeps, then shut it and sneak away some distance from you original position. Wait for the destroyers to gather and depth charge your original position, then turn towards them while they are clustered together and fire off your torpedoes. You can usually get one if not two hits! Rinse and repeat. You don't have to get to periscopic depth to fire torpedo, just get near to it when the ships are at first circle on your sonar. If they are further away you may even be able to fire at a deeper depth. Never attempt to fire after a moving destroyer, always wait for it to stop first. When you are bored, try fighting the destroyers using your sub as a boat and stay surfaced the whole time, since your sub is not that slow either.
Tip:
Concentrate on taking out all the anti-air units one by one before focusing on the tanks.
Tanks can fire at you if you fly too low
When using gun get in a stable level flying first, you're flight path is unaffected by where you aim your guns.
Use mouse to turn, move forward/backward, and A and D to level out. Hold w whenever you are loosing altitude. It is risky to use s, so to lower I usually just lower my helo nose, this will cause it to move forward but also lower its altitude.
If you are heading straight for cliffs try turning your helo around then acc forward if it is too late to pull up or move backwards.
You can actually land on level ground, then apply a little throttle and raise the plane just a bit, so you are almost level and stationart to the tanks. Much easier to straff and fire rockets this way. Becareful that some tanks will fire back.
Your helo won't crash if its body bumped the ground, bull will crash if its rotor touches the ground.
Woo hoo after some practice managed to finish the game! This was great but more features and levels would be nice. Had to land to resupply once.
Screen shot:
http://oi44.tinypic.com/29loh8l.jpg