It had similar vibes of Ready Or Not, ideas and themes of The Purge and the unpredictability of The Cabin In The Woods.
The first act is pretty strong and it really throws you off course as to who you think the main protagonist will be. That just set me up nicely for not having a clue of where it could go next.
It moves at a good pace, the violence is brutal but cartoonish in its execution, the gags are solid and go down brave but potentially dangerous routes. I was fine with them. But it wouldn't surprise if some might offend the SJW cinema-goers.
While the end was the most formulaic part of the film. The journey getting there made it a worthwhile watch.