For the vision, I really liked some of the designs, however I'm aware these are MMD models and you most likely downloaded them. However, I feel you did a very nice job putting this together; my one gripe is with the towers, the lines/squares in the center threw me off a little.
For originality, I've seen the dating games before, and I've seen the MMD interactive models, but never at random where you didn't know what was coming. I like how you combined the two and felt it fit nicely.
For the technique, I must say that I'm mesmerized by how you created this, although it's probably because I haven't worked with the MMD files at all. I understand working with them to get full-blown animation can be a bit difficult for something like deviantART, but for what you tried to accomplish I say you did a perfect job.
For the impact, I've definitely played Hetalia dating games before, but never like this one. You went beyond just which character you got and actually created places to go, which leaves the player wondering about what might happen. I personally had my mind blown and was left wondering what was going to happen between Germany and I in the dance club...considering I can't dance.
Overall, I must say this was a great deviation and something I'll definitely come back to when I'm looking to escape to the world of Hetalia.
Sorry if this isn't too good; this is my first Critique.