From Beggining to End
I liked the piano in the beginning. It was really catchy and had a great tone for starting for a song.
However, the sudden switch to the off-beat saw synth was sort of unexpected, as was the fast melody at 0:25. I would say to use some sort of filter to make it flow into that more smoother.
The main melody was very fun and catchy. I like the piano breakdown afterwards as well. The song itself is very unique but the structure was sort of unexpected, which I am sure, some studying would help with, but it IS your own style and you can do whatever you like :)
My Main problems with Mixing:
The High pitched saw synth was really loud compared to the other sounds, the fast melodies seemed to go too fast, maybe take out a few notes and add some longer ones to give more variation.
Also, I would recommend using a wide variety of different sounds. Some of your leads/synths, are really soft sounds and don't go well together. Make the bass heavier if you can :)
The chord progression was catchy and that is a plus as well. The sudden change in synths at 2:03 was also very random in my opinion. I would say if you wanted to make that as an ending, from what I presume, then you need to use a lot of effects and other sounds to make it flow more smoothly into that.
The main problem is your transitions, which I am sure you fix simply.
Anyways, Good work. Hope I could help. I don't know the extension of your skill or experience in making music, but I commented on anything I felt wrong, Hope I wasn't too harsh. Good Luck.