All in all the game took me about 21-22 hours to clear. It was very easy on the normal difficulty for most of the time, with spikes here and there. The reason for the difficulty for the most part was the whole party being hit in succession by AOE attacks and healer not healing in the most effective way. If you want the game to be real easy, invest in the roles I mentioned in my previous post and control Miki. The battles will take a while, because AI can't dish really good damage with the MC.
Not going to bother with the post game dungeon, because I feel like I had enough, but it's there for anyone interested. Like someone mentioned previously, it doesn't seem to be that long though.
As for my general impressions, I guess in the end I enjoyed playing through the game, but I think it's a terrible idea to use backtracking for your padding needs. The fields are few and far between, boring to boot, and going through them for the second-third time already felt like too much. And there's way more of that.
Another thing that bothered me were enemy recolors. Obviously, it happens in most RPGs, but because the game was so short, seeding 3-4 sets of the same group of enemies within a few hours was just sad.
The battle system was okay, nothing to write home about, but I still kind of enjoyed it in the later part of the game.
In general the game felt like a Tales game with lower budget, some interesting (and some poorly executed) new-ish ideas like cutscenes, and a sci-fi twist.