I seen a lot of times some players use high-fives wrong (fairly a lot less nowdays):

The biggest thing:
Maybe thinking that IF THEY high five you they get HP from you.
"You do not gain HP for high-fiving me.... You get HP from ME high-fiving you."
So lets remember: the person STARTED the high-five will give HP.

DO Not rush to grab the pizza as soon as you see it !!!

1. Clear the area of enemies (duuuh)
2. Use the high five mechanic before picking up single pizza. One player - usually the one with lowest HP shares as much HP as possible with the other players (with high fives as mentioned above) until he can't anymore.
3. He picks up the single pizza.
4. He shares more HP around to balance out the HP of the team.

That way you maximize the healing from just one pizza.

To quote Dodge ball once more:
"If you can dodge a wrench, you can dodge a ball"

1. Protect yourselves and disengage from combat when needed.
2. Learn enemy spawn locations/attacks. This will help you breeze thru the levels.
3. Learn bosses patterns. They telegraph their attacks a lot so you have time to avoid them and save some HP.
4. Attack the bosses on "your turn". After a few hits bosses tend to get a free "get out of stun" state and just punch/kick you! This is where you dodge!

1. Share the Sushi pickups! They give 10+ Points and can help get you closer to that much needed 1UP Extra life.
2. Don't all try to revive the same player!
3. Don't try to revive if that player is in a bad spot and has lots of extra lives, especialy if you have less extra lives! Sometimes is not worth risking reviving (as hard as it sounds) you both endup dying losing more resources in the long run.
4. Cover one another while you revive ot taunt! Or distract the bosses while reviving or taunting.

And as allways.... we are all in this to have fun together!!