I can't imagine who put the "comedy" label on this: there are a few amusing touches, but overall it's a drama with sci-fi roots.
The characters are well-acted - especially the three leads (also the improv leader and others).
The Barnaby character (played by Danny Cymbal) is irritating but that's exactly right for the story.
Similarly, I was initially underwhelmed by the Copper character but gradually realized he was played quite well (by Dennis Curlett).
Rose is a more sympathetic character and thus easier to appreciate, but there is some great subtlety in how Clarissa Thibeaux portrays her.
Oh, and the story, while not mind bending, is above average for time travel flicks, and doesn't get mired in mechanics or explanations.
And - as someone who gets irritated by background music fairly easily - I want to add that here it qas perfectly tuned to the film, such that I rarely even noticed it (this is meant as a high compliment).