First, I like the main melody!
Second, I like how you built those harmonies on it and started to build it up. I understand this is video game music, so I guess the fact that it's short is acceptable. I kind of think you should continue what you have though, and move into a double time melody. I think the 8 bit sound is good. Idk if I like the percussion sound though. It's maybe just a little too fuzzy and the tail a little too long.
Not bad though, just not defines enough.