MES

You had a nostalgia rush last night, so you decided to satisfy it by playing one of your favorite childhood games for the Mintendo Entertainment System, Attack of the Killer Robots. You popped in the cartridge and prepared for some rose-tinted fun when suddenly...
...nothing happened.
You turned off the MES, took out the cartridge, blew the dust out of it, put it back in, and turned on the MES. You found yourself playing the game, except you were inside of it!

Protect the MES! If it gets destroyed or you get killed, it's GAME OVER, literally.

Use the arrow keys to move, A to reload, D to shoot, and S to melee.