Very fluid, very smooth, and catchy to boot.
What I like about this beat is that it keeps the mood steady and doesn't break out into a full on hype. The build-up was essential to keep the listener interested in what you were creating and quite honestly, this snipit of glorious ear tickling goodness is what I needed at 1AM est :-)
I do have one gripe, and that would be the fact that it doesn't loop. With this kind of melody, a loop would have sit perfectly, even if the flow had to be adjusted. A prime example would be with the current cuts we hear in video game music today, cross-fading into the same track DOES help when basically jamming to a level's BGM kinda like the old NES/SNES/N64 and Earlier PC days...ahh memories.
Such a piece like this would benefit from a splice/loop.
But over-all I have to give you a 4.5/5 and a 5/5 ~ if you can make it smoothly loop with a slight extension ~ I will for sure grant you a 5/5 5/5 :-)
Keep up the good work