Agree with you - really good film, it's just a shame it was let down by a couple of ill-advised scenes, such as the snake part (no, don't start a fire!) and the fantasy rescue.
Watched this on Netflix with low expectations but I was very surprised indeed. The premise alone of having a film set entirely in a coffin is really brave and I was impressed they even made this film, but beyond that it works really well.
Credit to Ryan Reynolds as well. I don’t really rate him but he pulls this off.
Really can’t recommend it highly enough. Probably the best recent thriller I’ve seen. Genuinely surprising.