The Atlanteans have emerged from the depths and begun attacking humanity with their brilliant technology. Only one person can stop this invasion: Lethal Al. Because governments in this fictional world are too corrupt to spend their precious money on an army, they send only this one guy. The game has sound generated by artificial intelligence since I'm not a sound engineer, so if it bothers you, you can mute your computer.
Use the numbers to change weapons (1,2,3,4), the left and right arrows to rotate, and the forward and back arrows to move forward/backward.
You fire with "A" and open doors with "S".
Credits to Hapetu (https://www.construct.net/en/users/882159/hapetu) for the enemy blood code. Technically, I didn't ask for permission, so if he asks me to remove his code, I will.