Half-Line Miami is exactly what you think it is: a combination of Half-Life and Hotline Miami. Developer Thomas Kole combines the gravity gun and setting of the former with the top-down gameplay of the latter.
Released today on Kole's itch.io page, Half-Line Miami is a free download. It contains eight stages, with each one based on a section of Half-Life 2. There's also a level editor.
"I made this game as a declaration of my love for these two games, and as an experiment in game design," Kole said.
Check out how these two titles merge in the Half-Line Miami launch trailer below: