A simple advice from what I can hear, and your work in general: You should work on your melodies, and make them more interesting: for instance, add more variation to the rythmical values, all the notes sound like they are the same duration, and all the same distance apart in the scale. try to be more complex in the intervals you use, and to play more with the tension/resolution element. To be fair, I think the main way to improve that aspect is to wether play a real instrument or sing, and try to improvise or come up with new stuff.
The harmony is simple as well but that's okay for now!
And I have definitely seen some improvement, so keep going :)