Hi there! The intro to this track is pretty cool. The melody is simple and effective, and easy to grasp. That said, at 0:22 the piece gets a bit messy. The new instrument is lively and interesting, but it's also quite distracting, and clutters the mix. I think you might want to look into panning (and EQ), and see how you can utilize the stereo space more effectively. Also, the timbre of instrument might simply not be a great fit together with the rest of the track.
After the 1 minute mark, you used a pretty nice progression where you simplified the elements in the piece in order to allow for a new drop, which is a nice touch. I find that the melody at that part might be a bit repetitive though, and the snares sound very much like a computer played them (which is also the case). You could've tried using some kick drums for a similar effect, as they can be less abrasive for transitions.
I appreciate the alternation of the melody at 1:30. Once again, I feel like the background instrument distracts from the rest of the piece, though. Certain elements of the piece also sound a bit dry, so you might see where you could use reverb more effectively.
2:40 is an interesting breakdown, but I think the bass is too loud and "in your face" there. As for the part that comes afterwards, it has some nice rhythms, but I'm not very fond of the main instrument. Progressionwise, I think it's also a bit too long since it's a fairly repetitive section.
When you get back to the melodies at 4:12, the part almost sounds a bit dissonant. The melodies played don't sound like they go very well together, and the bass takes up a lot of space in the mix. The rhythm of the percussion also starts to become a bit samey, after having heard it for a while (despite some changes here and there).
The ending lacks any sort of real climax, which is a bit of a shame. For such a long track, a climax would've helped tie the track together. As for the last 10 seconds, I really like the way the instruments sound; I think it's a pretty good way to end the piece.
Some final thoughts... I think you've got some pretty nice ideas, but there are also things you could improve upon, which you will do if you keep working with music. You might also want to make tracks of this nature a bit shorter. The reason is that there are parts that are somewhat repetitive, without adding much value to the progression. For ambient pieces that can work well, but for a track of this nature you want to keep the listeners attention.
Welcome to newgrounds, and good luck with improving your work and having fun with music in the future!