This would have been a great Halloween Game!
I love the idea of equipping costumes set to get skills.
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For those having problems with stamina.
If you equip certain costumes you lose stamina.
For example in the last level I wanted to have 3 of my characters as star wars characters.
When I would start the level I would start with so little stamina I would die 3 seconds after.
To fix this try equipping different characters costumes till you get have one combination that give you enough stamina.
For example in last stage I had Jew(Kyle south park),Terry B(I though he was ash from pokemon lol),Captain and spartan.
That combination let me have enough stamina to farm the ninja turtles set.
After you farm it equip all your characters with ninja turtle set and you will have enough stamina to continue.
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My last team was Princess Peach, Master Chief, Leonardo and Link.
50% blocking Attack is the best stat in the game that why I had Leonardo and Link in front.
Third I had chief from Halo with 4 heal each 3 seconds.
Last I had princess Peach from Mario because she could absorb fishes and milk this is very helpful to level up fast and getting that milk you need to be able to have enough stamina to finish level.
Another tip is equip the one in front with both Meat head and Nyah cat rainbow body there 2 do not give bonus but they give you a lot of health to be able to tank a lot of damage. This is helpful in the 3rd level.