So, if you know you are going to wipe during the next galactus turn (i.e. there are enough cosmic tiles on the board to get him to 30 black AP), then just fire off any remaining abilities you have and then RETREAT BEFORE ENDING YOUR TURN, i.e. don’t make a match3 (or 4), just retreat instead. To retreat (on mobile interface) click pause/back button, then choose retreat option.
You will lose out on that last bit of match dmg (that you could have done if you performed a match3 or match4 and any cascades), BUT you still keep all the previous damage done to galactus … AND you only take the retreat health penalty (1/3 total health lost?) rather than a full team wipe. This will allow you to reuse that team for the next boss fight without using health packs (since they’ll be around 2/3 health now).
Note if you attempt to do the retreat during galactus’ turn (i.e. during his animations for gaining cosmic energy, or cd tiles, etc) then the client/server will have already wiped your team (even though the graphics haven’t shown it yet, the underlying code has already processed galactus’ turn and knows your team died).
Hopefully this tip will help ease the pressure on your health packs as we confront this deadly menance threatening our planet’s very existence.