Movie was going ok, but I don't know why someone would end the movie abruptly like that. As you can see with many other reviews, this movie lost at least 2 stars on average from majority of the reviews just because of that bad ending.
Don't they have anyone who can tell from a regular audience angle and say that they need to properly end the movie? What was this director or producers or other who got involved in this movie thinking? This is like mocking the audience who wasted the time till then.
At least by seeing all these reviews, I hope this director and others understand the mistake that how it didn't reach the audience properly and how they can correct it in their next movies.
SPOILER: I saw one comment from someone who guessed that this ending meant that gas already leaked and people are dead without realising it yet. I don't know if the movie makers already meant it, but it would've been a wonderful ending if it was shown like that. But instead these guys decided to spoil the ending.