From Brotato Wiki
You buy items using Max HP instead of materials
Character
Demon is a playable character in the game. Individual characters differ in their Stats and traits, to encourage a variety of play styles in Brotato.
How to Unlock
Win a run in Danger 5
Unlocks
Unlocks Obliterator if you win a game with Demon:
Starting Weapons
Demon has wide combinations of Melee Damage and Elemental Damage weapon with only 1 Ranged Damage weapon.
Shopping
For the Demon, items cost Max HP instead of Materials. At the end of each wave, half your materials are converted to Max HP at the rate of 13 Materials = 1 Max HP. Items in the shop have their price changed into Max HP at the rate of 20 Materials = 1 Max HP Rounded up. This means that if an item costs 1-20 Materials, it will cost 1 HP. 21-40 Materials will cost 2 HP and so on.
Coupon works like normal on Demon. It reduces the cost of the items, and if this pushes the item below a 20 material threshold, the Max HP cost goes down by 1.
So this is why a 
Torch costs 1 HP in the first shop, but 
Ghost Axe cost 2 HP.
During the early shops, items that grant an increase to your Max HP can often be bought for less HP than they grant. Take for example 
Broken Mouth, 
Cake, or 
Acid. This can give Demon free Max HP which also means free money during the early game. The items have downsides, but the free Max HP is more than often worth it in the early game.
The Demon is also able to use their starting 10 HP to shop with, and this allows the demon to make out like a bandit from the first few shops, while items are cheap. Experienced players often play Demon with 0-1 HP for the first 6-9 waves.
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