I like the upbeat synth riff at the beginning. The instruments are a bit cheesy, but I’m enjoying the cute mood and rhythmic content. The mix could be a bit sharper - over time, the main melody becomes less distinct, likely because other instruments are taking up the same frequency range. Especially during the busier sections, it might help to use equalizers more often. Also known as EQs, they’ll help you filter out the frequencies in the harmonic instruments (i.e., pretty much everything except the bass and drums) below about 200 Hertz. That’ll make all of the instruments sound much clearer because instruments with a similar frequency range tend to distort each other, especially on the low end of the spectrum. You may already know about equalizers, but you should use them way more often, is the point. Sometimes the excess of reverb in the texture also makes the piece sound muddy and distorted.
Anyway, the transition at 2:11 was a tad rough, despite your efforts to foreshadow that a transition was coming. It’s hard to do transitions with key changes without also changing the harmonies gradually to acclimate the listener to the new key. Then, when you add back the melody from the former key at 2:42, it sounds very dissonant - it seems to be a B flat major melody playing over C major chords. It might be better to transpose the old melody into the new key before adding it back. The outro is also pretty dissonant, especially after 4:02 or so.
Overall, I really like the blissful mood, cute synths, and catchy beats of the first half of the piece. I think you tried to get a bit too fancy with the second half of the piece, but it’s certainly not beyond repair. One good rule of thumb is that, usually, notes that are only 1-2 spaces apart on the piano roll (or can be transposed up or down by octaves so that they are) probably shouldn’t be playing at the same time. It also helps to highlight all of the tracks in your DAW at once so that you can see which notes are playing at the same time across all of the instruments.
Anyway, I hope you’ll keep working on this one. It has potential - you have a great sense of progression and rhythm. Really honing in on layering tonal harmonies over each other will be a great next step for you. Keep at it, Jok3004! ^_^
Mixing, mastering, and balance
1/2
Structure, transitions, phrasing, and variety
1/1.5
Melody, tonality, harmony, and texture
.75/2
Instrumentation and sound design
.5/1
Emotion, atmosphere, and catchiness
1/1.5
Originality and uniqueness
.5/1
Overall (how do the elements above interact?)
.5/1
Composite score
5.25/10