I did make it into a longer, more complex tune. i just sent it to you as a Final Project Part 2. Hopefully you will receive it and can see the changes I've made.
It's unfolding really well, great job. You might be able to improve a bit if you take a closer look at your channel 5. Right now it's a pretty harsh and dry sound and it sticks out. Using fader on the mixer might help but you can also experiment with shortening the envelope (lowering sustain, shorter release, shorter MIDI notes) or perhaps experimenting with effects to blend this track better with the rest. But overall it's going well!