I think it's an interesting interpretation of Gregorian chants, befitting more a cinematic score with Gregorian elements. This is, in fact, more complex and layered than what I would expect a Gregorian chant to sound like, which is usually monodic. The melody itself is quite beautiful and solemn—I don't find the chords cheesy at all, as some stylistic choices do add some interesting colors to otherwise dare I say predictable progressions. Case in point here at 0:43 (is that a Dmaj6/9?), and 01:07 followed by a gorgeous resolution. My verdict is that there's more than meets the eye, and I think this is a good example of a track that does just enough to make the storytelling feel more endearing than you would expect.