Great start! You have three distinct sections, but I would make your A sections at the beginning and the end a tiny bit shorter. I might add another part to the A sections as well...another synth line? Or maybe a Bass part? Try a couple and see what you think. Lastly, I'd make your B section just a little bit longer, and see if you could time stretch the vocals in the C section (see me if you don't know what I'm talking about). Good job, try my fixes to get your way to an A plus!