Famitracker is hard to master, but it's one of the most straight forward trackers out there. And once you get the hang of it, the skills transfer to all other sorts of trackers as well. I would definitely recommend it.
What you have is pretty good though, I honestly couldn't even tell it was beepbox just by listening. But many effects like vibrato, tremolo, volume control, tempo changes, and pitch bending are absent from beepbox. So if you want more control over your music, take the time to make the switch to a tracker.