Happiness
Well I have to say this gives a real happy feel to it. Would love to see it used in a side scroller, platform, or simply as opening/credit music since it has a real happy feel to it. While you play you don't feel so annoyed and you would just enjoy playing for the most part too.
The synth has two sides I see. One side plays some lighter and longer notes while the other plays a bit lower yet faster notes. Really like the synth solo used here since it makes the song sound pretty epic.
The bass line is so simple yet very smooth in this as it plays some simple notes for the user to enjoy anyways. Very pleasing. The drums are nice and sound as if they were paired with clapping which is nice.
Around 2:36 I liked it a lot as it sounded as if you had added in real guitars to the mix to play along too, very nice touch there I think.
Overall, very amazing piece of work.