I really like the chill section at the beginning. The transition at :21 was a little bizarre. You change moods really quickly without really carrying over a lot of elements between the two distinct sections, making for a rather jarring experience. The synth at :51 also sounds like it's getting really distorted somehow, but I can't tell if that's because of excessive reverb or excessive compression. I also thought the part at 1:13 had some really harsh tones in the treble register that should probably get filtered out. The transition back to the chill section at 1:37 was basically non-existent. I really like the two isolated elements of the piece (chill section and energetic section), but they really are quite isolated. Given that this piece is so short, I'd suggest that you commit a solid 20-second section at both :21 and 1:37 to create a build-up to the energetic section and then slowly strip away its energy, respectively. My favorite part of the piece was probably :25, though. Super catchy. You clearly have a good sense of rhythm. Anyway, hope my advice is helpful. Keep at it, man!