Cute! (It’s a bit difficult, though.)
However, I discovered a bug related to the first shark (Megalodon?) and totally dominated it. (But then I got completely wrecked in the second fight.) You can actually defeat it just by sticking to the shark and attacking! (Also, if you lose to the enemy in the second fight, it sometimes keeps attacking even after you’re defeated…)
I haven’t managed to clear it in the end, but the concept is really interesting!