You are playing as a bootleg Adrian Shephard! You are in Black Mesa and there are lots of headcrabs for no reason. Maybe a portal to Xen of something. There's also Gonarchs for no reason and they have baby headcrabs which are really annoying.
You can kill yourself with your own bombs so don't spam them. (There's no cooldown)
The game ends after the big Gonarch.
This was made as a joke.