I really like the art style! It has a very "imscared" meets old-school photo low-res look. Combined with the white-noise-like gunfire, the whole thing has a kind of a gritty edge to it.
I downloaded the EXE because the web version kept crashing (massive respect for that 1 MB file size btw!!) and, uh...
It seems like the FPS is unlocked, is running thousands of frames per second, and is using up to 70% of my GPU. It doesn't seem to run fast or anything, so I guess DeltaTime() is working properly. It's not a huge deal, since it's only a five-minute game, but definitely something to keep in mind for the future!
Otherwise, good job!