Great work! The left hand looks challenging but doable. I would look to alternatives for measure 6 though, as the LH part moves uncomfortably into the melody's range; perhaps lower the offbeat harmonies a bit or something.
I wouldn't have published it if it wasn't doable. I can play it, I haven't recorded it decently yet, but just to give proof of concept, I'll give you a recording with some wrong notes: http://www.mediafire.com/file/avhy2fc13asqv12/Parasailing_minigame.mp3
M6 shouldn't be a problem to play, the right hand can easily take some notes of the left hand, I'll just redistribute the notes. I was worried more of the LH in the last bars, but it's absolutely doable, as you can hear in the audio, it's not even that hard actually (at least for me). The thing I changed there is that I moved the D in the bass one octave up, if you didn't notice. I didn't find better solutions, trying to sound as close as possible to the OST. I might do some changes anyway, to other bars, it's not definitive yet. It's a good starting point
I would definitely say that this sheet deserves more space - briefly experimenting, personally I would go for all three-measure systems (except for the first and last, which would have four).
Oh, and perhaps use a dotted quarter in m. 10 beat 3?
Actually, the last tied D was supposed to be a pause, like in m11. My bad. One thing I have to change is that tenuto on the F in m12. It doesn't make sense on a piano, unfortunately. And I know since I played it, as you can see lol (if you're wondering, I compose and arrange away
from the piano. I found with experience that it's a lot better and faster, at least for me)