I have enjoyed the movie for the most part. Setup was interesting, the eerie atmosphere of the potential experiment going bad is present and is made well.
The story is nothing new. It is scary if you think about, how something similar might be happening in real life. Certainly, it's not going the way it is going in the movie though, because it would be really practically unreasonable and unrealistic, like "ha-ha, we are evil pharma, now we gonna make yall suffer cause that's what we do, ha-ha". Don't even get me started on that 'drug' and the death scenes (to me it seems highly implausible and overdramatic)... Yet even distant possibility of similar experiments is enough to consider and is something to be alerted about.
Millie Brady is beautiful, but the characters are quite superficial. Can't say it's a big problem for a type of movie this is. We do get a small insight in each of their lives, but it's not dramatic enough to make us care really, apart from the main heroine (where we get bit more, while still not really enough). Most character interactions and dialogues are no good.
Execution is on a 'okay' level I'd say. Obviously, looks like budget is limited (the whole movie takes place in like 3 rooms, and each of them is sterile, which can be explained by this being a locked experimental facility and/or also low movie budget and the lack of attention to detail at the same time), yet the existing scenes seem to be well made. In other words, camera operators and editors did their job well. Overall, the picture is a pleasant view.
The ending is controversial to me. It is logical story wise and obviously we all root for the main character, yet ideologically it's empty and it's also unrealistic, so its not satisfying to anyone who wants some answers or an unexpected turn, or something similar.
All that said, somehow, I did enjoy it for the most part still, I guess my expectations were low and I really liked the setup and the image, and Millie Brady of course. So I'd say my scoring here is generous.