Most of the actual gameplay in E.V.O. isn't all that hard... but then you come to the bosses, and they're way bigger, stronger, and more maneuverable than you, which hardly seems fair.

But you have one weapon on your side, your Evo menu.

If you're low on health, pop it open

And choose anything, like changing the length of your neck, which doesn't affect your attack or defense

And when the process is complete, full health!

Any minor change will do it, so it's usually a good idea to stock up on E.V.O. points before facing a tough challenge.