This isn't bad at all for being new to music! Some suggestions would be to try and create shorter melodies, a "motif" which will allow your track to be more memorable and catchy (as well as fit better as video game music). Longer melodies have their place, but if not done right, it ends up sounding random and lacking in structure. I really liked the backing synths here. Another tip would be to take chord progressions and try to write a repeating melody over them, with variations later on. (Of course, don't feel limited to just looping the same chords over and over!) That will assist you in making more memorable melodies! Keep it up!