HeWantsToLive

This is a side-scrolling action game. Control him well and keep him alive. He lives by the following rules:

When he breathes oxygen, he enters his initial state.
When he breathes hydrogen, he becomes lighter.
When he drinks water, he feels well enough to climb a hill.
Carbon monoxide is a poison to him.
Nitrogen monoxide is poisonous to him.
When he touches gold, he can survive.

No reflexes are required for this game. However, it does require calm judgment and a little knowledge of chemistry.