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.
Use WASD or Arrow keys to move, press Down Arrow to start laboratory researching or growing plant, Mouse to shoot, Shift to reload, 1-8 numkeys to change gun.