I like the pensive piano riff at the beginning. It sounds a bit overly contained in the mix, though. I’d suggest giving it a bit more room to breathe in the EQ. Relative to the beat at :12, the piano sounds really quiet too, and in fact the track in general is probably too loud. I’m also not a big fan of the snare at :26 - sounds a bit dry and flat. There are also some abrupt transitions here, like at :52, 1:29, 2:21, 2:59, etc.
Other than that, the rest of the piece is rather repetitive, despite some rhythmic variations and the more atmospheric direction you took at 3:12. I’d encourage you to add some more depth to the harmonies here - layering on additional instruments after a while, changing the contour of the pitches in the original riffs, etc. You could also do a lot more with the drums here - you seem to have a couple of drum patterns that are copy-pasted between sections. I think you could create some variety in the texture and help smooth over some of these transitions by creating some rolled snares or other drum fills during transitory moments, with a crash on the downbeat.
Sorry if this isn’t a very positive review, but for what it’s worth I’m impressed you made this in just a little over an hour. I think you could stand to put more effort into the composition, as well as rein in the volume levels at times (especially 2:56), but otherwise there are some catchy riffs and cool rhythmic ideas here that are worth exploring further. Keep at it, Exdrumi! ^_^
Mixing, mastering, and balance
1/2
Structure, transitions, phrasing, and variety
.75/1.5
Melody, tonality, harmony, and texture
1/2
Instrumentation and sound design
.25/1
Emotion, atmosphere, and catchiness
1/1.5
Originality and uniqueness
.5/1
Overall (how do the elements above interact?)
1/1
Composite score
5.5/10