1. Tales of Xillia 2
2. Trails of Cold Steel
3. Ni No Kuni 2
4. Trails of Cold Steel 2
5. Valkyria Chronicles 4
My final list for 2018. Trails of Cold Steel 2 definitely wins "best game" award out of those 5.
I didn't quite reach my "finish one game every two months" goal, but it evens out since I started and experienced several other games that aren't on this list because they weren't completed. Namely, Final Fantasy VII: A New Threat, Dragon Quest XI, Octopath Traveler, and Smash Ultimate.