'Grats on finishing your first narrative film!
story doesn't really make any sense (...) we came up with it as we were filming it
Please don't do that again.
Btw, the ending is terribly cliché (and serves no purpose).
Now that that's
out of the way...
... it had several cool elements to it. Are you serious about making more shorts that tie into this? With effort, you could come up with something pretty entertaining. Take the time to really sit down & develop the properties and characters you've established, and you could make this work.
If you need some inspiration, there's a few threads on the forums that cover films/shorts with only one or two characters in them, and in contained areas. Maybe look some of those up.