Real nifty!
It's got that forward momentum that a chorale really needs.
Although, it sounds incomplete. It feels like there should be more to it ya know?

Thank you. c:
That's a really good way to think about a chorale now that you mention it. I really should keep that more at the front of my mind when working on this sort of piece. Thanks for the feedback. <3

I agree with you on the incomplete part though. It starts in the key of C, but end in the key of G (not via half cadence, just as a consequence of the overall progression) which is why it doesn't sound quite right. I was leaving to go on a trip the day I posted this, so I decided to leave it there, but had I continued to work on this song for more than one day I would have attempted to bring it back around to the key of C in another half to make it feel more complete.

Well, that's terrific. You also might have been able to get away with ending in the key of E Major, since E is the Major 3rd in the key of C Major.
I'm assuming that ending in G Major doesn't work because G is the 5th in the key of C, and 5ths are hollow chords that can't be determined as major or minor.

Just a Thought!

You're thinking of an open fifth, which isn't the same as being in a relative dominant mode, but you have the right general idea.
In longer Chorals it's rather common to do something akin to an ABA pattern with B in the key a fifth away, usually preceded by a half cadence from the first A section. I got though the AB part, but then ran out of time/motivation and forced an ending more or less, which your ear recognizes in addition to the song ending on a different chord then it started. I may revise this piece at some point in the future so hopefully I'll come up with a better ending by then. :P

Bingo! Excellent theory-work! :3