For a movie that dedicates the first fifty minutes to doing literally nothing but telling the audience 'look how smart we are,' I'm surprised at how unbelievably dumb this film really is. The film takes its time in setting up everything, and it does this at an excruciating rate. There's no actual time travel until halfway through the movie, and by that stage, I'd lost most of my interest in the film. It tried to redeem itself, it did. It tried to have a little bit of fun once the time travel begun to be fully utilised, but even then, it's just not that interesting a movie.
There was seriously no need to show the building of the machine in that much detail. We get it. Time machines are hard to make and use up a lot of batteries, now don't go and show me every test, just show me the important ones. Show me the ones that matter and that will actually move the plot forward. There's no need to spend so much time getting to the scenes we actually want to see, despite these scenes turning out to be rather underwhelming and pointless too.
To sum up, Project Almanac tries to set itself up to be a really smart movie, yet somehow manages to get dumber and dumber as the movies goes on, creating multiple plot holes and inconsistencies along the way.