In this game you are a slug and you have to get from the entrance pipe to the exit pipe. On your way, you have to keep an eye on your PH-level, which is indicated in the lower part of the screen. If it is too high or too low, you will suffer damage. You also have to watch out for all sorts of enemies that will take your life, like slug-eating plants, birds and machinery. Good luck!
Use the arrow keys or WASD to move.