It's hard not to see the parallels between this film and the likes of RIO BRAVO or the the above mentioned John Carpenter film. This film isn't perfect by any means but functions well as a down and dirty urban crime / action thriller with a few cute surprises sprinkled in that any fan of 60's-80's "grindhouse" would appreciate. It's pretty clear that the makers of VFW pulled a little bit of inspiration from this, especially in terms of musical score.
One thing ASSAULT didn't even attempt to do was make its villains sympathetic in any way, but this film gives them about 30-35% of the dialog and attention, making each one of their deaths a little more meaningful. I loved the varying degrees to which the villains stayed committed to the crime and greater adherence to realism in general. People in this film act about like how you or I would react to a situation here and there isn't a lot of James Bond style heroics at play.
That said, it isn't quite a classic by any stretch. My main beef with the film is that it's just too convenient in many places. For one, of all the places the person fleeing from an angry mob in all of Canada, it just happens to be the place next door to a doomsday prepper with the means of building rockets and grenades at his disposal. Also, the fun idea of the shared medicine cabinet feels a bit ludicrous when compared to the fairly grounded reality of the rest of the movie. The main protagonists do not get introduced until late in the film, giving them very little room to build character development or strong audience sympathy. The viewer may never fully connect to the characters, but the short length and constant sense of immediacy keep things from ever getting dull.
Overall I considered myself surprised by how well this extremely low budget film comes together despite its relative obscurity. It's a shame that Donovan's next film DEF-CON IV would be such a letdown (after an excellent first half) and that afterward he'd generally stick to making more profitable (but even more forgettable) kids' films.