This is a fun film. As others have said, it's part grindhouse & part kung-fu. You will see nods to The Big Boss, Enter the Dragon, Old Boy & others. Mitsutake & Imai are creative with the camera. CGI effects are not bad, and most of the actors are capable. There are some scripted surprises & some shocking kills. There is plenty of cinematic humor here, but no nyuk-nyuk dialogue jokes.
If not for the abundant use of slow-mo, this movie could've clocked in at around 45 mins. The sound effects were fine, but the reliance on cheap, overly-orchestrated soundtrack music detracted from the experience - but that's a common problem in low-budget films. I was disappointed in Katarina Severen's featured role. She showcased her wrestling-ring skills plenty, but her theatre skills were lacking. Same goes for Tomm Voss. Both were simple caricatures & could've been stronger in their villain roles. Sadly, the shallow script did not help them any.
California is always a poor substitute for Texas, but the compound set in the finale was suitable. Contrary to a previous reviewer, there is no "sociological insight" here, and there is no adolescent Trump-bashing. This film is a very straightforward hostage plot ala Taken, but much simpler.
I would take this film over a thousand similarly low-budget "horror" films, the kind seemingly cranked out by any kid with a Black Magic camera these days. Mitsutake needs a better screenwriter, but at least he knows how to tell an entertaining story. I look forward to seeing his other projects.