I had to watch this on YouTube because the file doesn't seem to be working.
Anyway, this Flash has a very nostalgic feel to it, which makes sense given that it's over a decade old now. The graphics are pretty good for their time; in fact, the vectors look great, very crisp and colorful.
The music selection, in particular, Closer, also make this feel very stylized and fit to the time period in which this was made. The poor animation and sound effects could have been fixed, in my opinion. Frame by frame animation was possible with early versions of Flash, wasn't it? I'd say the sounds could have been better too, but I know online sound libraries weren't as big or high-quality in 2001 as they are now.
Overall this is pretty good. The over-the-top violence and bad humor, plus the shooting bit at the end, make this very reminiscent of the types of games that existed back in the very early 00s.