Good concept. The end was a bit worse than I expected, but in general not bad.
I think it would've been better to place the monster in one of the buildings in the city. The graphics are pretty good (even in low resolutions on my toaster :D), but the model doesn't really work in clear light
Oh, and sometimes they were a bit expected (sometimes I could predict where the next appearance will be before going in there). The creature also only appeared in the lights which made its appearance a bit less surprising.
But overall, for your first game this is really good.