My entry for compo 43 (and the first thing I ever publish). Similarities with other game franchises are partly coincidental.
Pest Controller Manfred E. Goron is called to the transportation testing facility in Black Mesa, where a shipment to the Bio-Labs has crashed and 45 headcrabs have escaped. They must be neutralized without harming the staff and since there are more targets than darts in the tranquilizer-gun, the dynamic environment must be used to be more effective.
Edit: silentwad.wad was missing, I added it to the file.
Edit2: Here is a walkthrough like I intended it:
https://www.youtube.com/watch?v=5P3FbkIIKKk
I added the missing wad to the file, sorry for the delay.