1) Energy rezzing
When you die, you see the panel to pay for a rez. You return with full health. (Also, did you know that if a party member has died you can click on their little tab on the left side of the game screen and on the menu you can pay to revive them even if you yourself are not dead?)
2) Health sharing
When someone dies, you can walk up to them, press the attack button, and give up half of your health to them. I think you get a portion of their gathered heat for doing this.
3) Rez on next floor
If you die but the rest of your party makes it to the elevator, you'll start on the next floor with 3 bars of energy.
Discuss.
I think Energy rezzing should be a last resort.
Health sharing should be the primary way to rez, simply because giving everyone the option to pay energy to rez and get back into action before a friend with 20 bars of health can run over to revive you seems a bit... Money grubby, I suppose.
Energy should be used when the whole party dies, since they bring you back to full health and they cost money, they're more like continues than rezzes.
I'd like to see a little game over style screen when you die instead of just a thunderbolt sound. Maybe some depressing music.
As for rezzing on the next floor, I think players with less than 3 bars of health should be bumped up to 3 bars of health on the next floor, too.
I'm not sure if that happens or not now, but I don't think it does.