I bought KH3D the day it came out, and I literally waited outside the game stop until they opened because I was so anxious to get the game. In fact, I actually bought my first 3DS with my own money just to play the game. I played it the minute I got home, and loved it within the first 5 minutes of gameplay. It's really addicting and I love playing it. The dream eaters are so adorable, and i love the fact I can pet them.
I love the The World Ends With You is a part of the series now, it's a nice change of pace, and now Sora and Riku can connect with characters that are around their age who are sharing in their ordeal of losing their home world. And it's nice to see what purpose Traverse Town has and why it wasn't needed in Kingdom Hearts 2.
The game play mechanics are awesome. Not too hard to use special attacks like spells and strikes, which are all killer when done right. Flowmotion is a nice change of pace and brings a new element of attacks to the table, and I like that, and actually being able to use the enemy Dream Eaters themselves as a weapon is just amazing. Also, I love all the new worlds that were added, and the addition to Traverse Town as well. The areas are so wide and vast, that you don't know if you've seen everything until you check every square inch of the place.
All in all, I love the game, always loved the Kingdom Hearts series ever since the first game came out 10 years ago, and I'm already in my 20's and still loving it, and this game was just the sweet, sweet icing on the Disney cake