Damn, I've been slow the entire day, but I have to admit that this one really brought me up! I'm not usually a large fan of dance music, but this one is just so oozing with happy that I can't even try not to like it.
As I'm not really knowledgeable when it comes to this genre, I can only say a couple of things: I really liked the exchange between the softer parts that served as build-up, as well as the bouncing bass parts they led up to. The synths didn't really sound as something extremely original to me, but they fit the song perfectly and rounded the feeling of it rather nicely, so I couldn't really care less. Both the main melody and the fills were really satisfying in their place, and I wouldn't change absolutely anything about them.
The picked sound you mentioned was really nice, actually - it has that nice celtic harp-ish feel that I could often use in many of my songs. It also added a nice finale that differed a bit from the standard evolution of the song up to that point, which is always a welcome addition.
As I said, really liked this one; favorited and showered with all the numbers dividable by 5 I could get my hands on.