I can't say much about the plot without ruining the movie, but it is a slow starter, once you get about 15 minutes in, it picks up. but it is still a relatively slow film. This is a very strange film, and I feel like it is one of those stories that deserves a sequel that it will never get. It really introduces this unique take on parallel universes, it is more of a fantasy film than anything else as it is not rooted in reality at all, it has it's own rules, many of which are not fully explained because even the characters don't know the answers, and by the end you will be left with many many questions that won't be answered and you can only guess at.
The acting, other than from Mark's girlfriend Catherine(who is barely in the film thankfully), is quite good. The two leads are both very convincing, even if this wasn't a low-budget film they would still hold up. The lighting is generally well-done, the sound is good, the very few effects utilized are very well-done. I don't have much negative to say about it on the whole, other than I wish it were 10 minutes longer and we knew a little bit more about the main characters, the unanswered questions are perfectly fine, but it could really use a few more moments of backstory for the Mark particularly, we know enough to care some, but it could be a bit stronger in that department. All it would have taken were a few more flashbacks.
It is definitely a philosophical film, and since it is a pretty short film, I am likely to go back and watch it again just to catch all of the little nuances that it contains. It touches upon a lot of ethical and moral questions, and I cannot get into them without spoiling the plot, so if the plot synopsis sounds interesting and you like films that make you think and are low-budget, it is worth a shot.