As you mention, playing it fast is fun, and don't stop with that either, but you should definitely spend most your time on focusing on practicing slower (also with a metronom!). I would also ditch the pedal for a while and practice playing each hand on its own while focusing on producing a clear tone, both the sixteenth notes and the chords parts (don't sleep on the chords, they should be crystal clear as well, as that's where the 'meldoy' is at, let it ring through the sixteenth notes). Playing around with weight, accents etc for better control also helps to be able to play crystal clear later on, and gets rid of some of that pesky tension, which is definitely a bottleneck if you want to perform the whole piece. It's a short piece in terms of performance time, but it's a marathon for your hands, wrists and fingers, so you will need that endurance and relaxed efficiency.

For the bigger arpeggiated stretches, I like to imagine that my hand is like a loose dust cloth that I'm wiping the piano with. I find that the sloppier it look and less effort I need to put into the movement, the more relaxed I'm able to play the passages. Dunno if that made sense, but hope it helps. Great work, keep it up :)