Great arrangement, and great job with your formatting! Good formatting gives me more time to look at other possibilities for improving an arrangement! ^^
-It looks like you don't have any dynamic marking indication. Even though the dynamics are relative in these old game tunes, we require at least an opening dynamic for piano arrangements hosted on the site.
-These are the only incorrect pitches: M9, 13, 21, & 17, LH: the B should be a C above that.
-In measure 9 (and everywhere else this occurs) the RH has the rhythm eighth note-quarter rest-eighth note. While there is nothing wrong with having this rhythm, I've learned in my own experience that breaking the quarter rest into two eighth rests and beaming the two notes together can sometimes make it easier to put that second note in the right place for the player.
-As for the form, I would simplify it with repeats so that it A) makes it easier to see what's going on from a larger perspective, and B) to conserve space that we'll need for explaining the LH variations to come. What I suggest is having measures 1-4 repeat (deleting the written out repeat that is 5-8), then having measures 9-16 repeat (also deleting 17-end, which is the same material as 9-16). After this, I would add a "D.C. last X" at the end of measure 16 to signify a repeat of the entire piece.
As for the LH variations, I would write them out like this: [MUS]
(due to some wizardry, the playback works)