I'd say Majikoi A-1 and A-2 qualify, even if they're fandiscs. I count them as fully independent releases, and they're pretty big.
I'd also count Nekopara Vol. 2 for sure. That might actually tilt the vote a little, the nekopara fanbase is scary, lol.
And if it was me, i'd throw in Koiken Otome just because it was a somewhat popular release, even if it wasn't particularly well received.
edit: There's also...
Bunny Black 2 if you're doing gameplay VNs
Tomoyo After if you want to count a retranslated, enhanced release (and Muv Luv for just a retranslated release)
Funbag Fantasy because it's a popular nukige
Yoake Mae yori Ruri Iro na had a full translation release although theoretically an improved translation is still on the way (same with Dracu-Riot, tho less "theoretical")
Nurse Love Addiction was a solid yuri release.
Kiss for the Petals - New Generation as well, though it's not quite as highly rated as NLA.
Not quite sure what kind of standards you're using here, but these are the other most notable releases of the year to me. I don't really think they stand much of a chance of actually winning it all but some of them may do better than some of the other games present.