definitely a good start...
You should definitely extend this one and add mixing effects and background sounds, automations and everything. This has a really good melody and a great choice of saw/synth or whatever. Try to add more melodies though too("IF" you are extending it into an actual song) so that it won't be so repetitive.
so yeah, you are off to a good beginning on this one. work on it =).
But don't get me wrong here. Right now at the moment, this is really good for a videogame.