Alien Attack

You have to collect the notes from the trees while avoiding the aliens. You can charge up your gun by holding left click and then release when it's charged up to fire it. Right click to reload after firing.

Once you have all 10 notes, you can return to the shack you started in to improve your weapon and obliterate the aliens. If you can find the secret in the sky and reach it, you can challenge the boss alien and get the true ending.

Have fun!