Premise - 16/20 - A simple premise, but eventually a bit misleading. Regardless of that, I like the occasional small cast, no frills thriller, so I'm in.
Cast/characters - 16/20 - Great lead. Good supporting cast. Interesting characters, but not enough time to really develop them; however, their backstories are hinted enough to where we understand motivation.
Story - 18/20 - Dialogue, and then a twist. Dialogue, and then a twist. A little action, and then a twist. I like that strategy, because you never feel comfortable. This is where the premise was misleading, though; it wasn't really a "whodunnit?", but more of a constant "what the hell do I do now?" issue. That made it a great watch with a pleasant ending. The director did a lot with a little.
Dialogue - 13/20 - Very direct dialogue. Hinting at backstories, showing character traits, explaining mindset. All of that made the last half of the movie understandable. The knock, then, is that for a small cast, dialogue is key, and this is really bare bones with great delivery.
World-building - 12/20 - Blizzard, secluded area in the mountains, basically one small room and some external shots. Nothing crazy, but all of it useful to the story.

75/100 - 4/5 stars - I thought it was great. Simple and not extremely original, but it was like a play that simmers through Act I, gives you a new perspective in Act II, and hammers home Act III. I'll recommend this one as a quick and riveting watch.

FULL SPOILER-FREE REVIEW @ https://www.msbreviews.com/movie-reviews/no-exit-spoiler-free-review

"No Exit is one of the biggest surprises of the year, shocking viewers with an extremely (in)tense narrative full of suspense, twists, and high levels of entertainment.

Damien Power takes the simple premise of his screenwriters and builds an immersive atmosphere through single-location filmmaking, where the camera work and the score are technical highlights in a visually fascinating work.

Havana Rose Liu contributes tremendously with a superb lead debut as the smart and courageous protagonist. Apart from some characterization details that become irrelevant or accidentally depicted in a strangely positive manner, it's hard to imagine the general public not enjoying such an unpredictable, constantly captivating story.

At the time of this review, it's one of the best films of the year."

Rating: A-