Feeders

Earth was only an appetizer.

Low budget direct-to-video sci-fi horror film made by Mark and John Polonia in 1996.

Reportedly produced on a budget of five hundred dollars and shot with a consumer camcorder, Feeders follows buddies Derek and Bennett as their road trip gets sidelined by an invasion of people-eating aliens. It was followed by a Christmas-themed horror-comedy sequel.

Tropes used in Feeders include:

Aerosol Flamethrower: Employed by Michelle.
Alien Abduction: Bennett; others sometime prior to the film.
Alien Invasion: The feeders are coming.
A Man Is Not a Virgin: Averted. Derek is the only one to make it out of the film alive, besides runaway Action Chick Michelle. Derek is also a virgin. He's almost a Final Girl.
Ambiguous Clone Ending: After Bennett is abducted and cloned, a clone fight ensues. Derek attempts to resolve the thing by picking one and killing it with an axe. It's not clear until the credits that he picked incorrectly.
Badass Santa: In Slay Bells, Santa defeats almost all the Feeders with a ray gun.
Chaste Hero: Derek.
Covers Always Lie: Perhaps a minor point, but the tagline on the box states that "Earth was only an appetizer" when the film is indeed set entirely on Earth.
Direct to Video: ... but carried and promoted by Blockbuster at the time of its release, raising its profile slightly.
Don't Go in The Woods
Eighties Hair: Derek again.
Flying Saucer: The feeders get around in classic style.
Hollywood Acid: Feeders spit a bubbly acidic substance to subdue their delicious prey.
Horrible Camping Trip: The whole film is sort of a horrible road trip for Derek and Bennett, but when they decide to camp out, It Gets Worse.
Kill'Em All: Pretty much everyone gets eaten except Michelle, who disappears halfway through the film, and Derek. On the other hand, the film ends with an impending invasion, so they're probably doomed too..
Making Use of the Twin: John Polonia plays Bennett, but Mark Polonia is credited as "Evil Bennett".
Nerds Are Virgins: Derek, our nerd protagonist.
No Budget
Plot-Driven Breakdown: Derek's Mustang.
Public Domain Soundtrack: On a $500 budget, this was a given.
Spot the Imposter: When Bennett is cloned, Derek must pick the correct Bennett to kill. He doesn't. And this sentence is here just to keep the length of the spoiler from making it easy to guess. Move along.
Stock Footage: Including footage from Night of the Living Dead.
The End of the World as We Know It: Implied by the ending.
To Serve Man: The whole point.
What Happened to the Mouse?: Michelle shows up, fights her way out of a tough spot, and then runs away from the entire film, never to be mentioned again.