I like your melodies and kind of careless swag in this. What concerns me is the filter you have on the entire song. It was well-suited at the beginning and near the ends, but overall the song was muffled and compressed as the mid-high and high frequencies were missing. When the drums came at 0:26 there was opportunity for it to sound big but the cutoff prevents this from happening throughout the song. That's my only advice in regards to production at this point. But if it's all intentional, by all means disregard.
Other than that one thing, like I said the song is jammin, the swing and rhythm is good, and I agree with the below review, this would be great with vocals! Keep at it~