Not bad. The melody is pretty nice, but it gets pretty repetitive. The square lead can get a bit grating after three minutes too. Another thing you could try is adding a bit more background and some more tropical instruments. For example, maybe download some tropical drum loops and look into a guitar vst or something like Nexus. Sylenth would also help with creating leads. You're definitely improving, you just need a nudge in the right direction sometimes, and that's what I'm here to help with :)