Great job!
I love the way you used the bass (especially in the beginning), something at which I myself pretty much suck. For some reason the beginning of this piece reminds me of the Futurama intro/theme slightly. Parts of the composition aslo seem a bit similar to some Crash Bandicoot 2 songs, however I cannot name them. In general, for some reason I can't name, this makes me think about several retro games, which is also equivalent to WELL DONE!
I'm also fond of the way you switch the 'main' intruments, which are the ones that are responsible for the main melodies.
One cannot dislike that transition at 0:55-0:58 (as well as the melody after it). Which in turn brings me to compliment you one the ways you use several different sections in this song; one has no time to get bored, and must press the replay button. I can't comprehend how you managed to fit so many different styles into one piece and improved the arrangement by doing it o.O
As much as I like the ending, I can imagine the piece having been even greater if you would've made it into a loop! However, one cannot have everything :p
When it comes to the mixing and the use of different instruments, I don't feel confident enough to review those parts that much, since I need to find a better grasp of those elements myself. What I can say is that I personally don't find much if any flaw with them (that part at 2:26 might have emerged a bit suddenly from nowhere, but I still like it).
As we can conclude, overall: Really good job, keep it up!