Infinite ammo. Invulnerability.
99% of population is dead after world nuclear war. Survived animals mutated. No plants, no trees, no oxygen remain on Earth. You got a viable seed - it`s time for ressurection. Kill mutants, upgrade your gun and increase skills to grow the plant.
Moving - Arrows or WASD
Start laboratory researching or growing plant - DOWN arrow
Shoot - Mouse
Gun reload - SHIFT
Gun change - 1-8 digits