@lrdobe
1-spread your units quickly to the first spots
.
2-when you have 6-7 units, spread them up to the bosses so that they are only attacking 5-6 units at once.
3- keep one unit away from the battlefield, and use him to get more units.
4- when you have 15-20 units, attack 1 boss at a time and click as fast as you can to sawn them,
good luck. I got lucky and spawned jaws(the one with a lot of damage), and that made it easy :P
if you want to try to finish the game go to appdata\Macromedia\Flash Player\#SharedObjects\AGRP9WJP\chat.kongregate.com\gamez\0005 and delete the 2567 folder