https://www.youtube.com/watch?v=kJatmYN3hGw
Note changes at 0:57 down to F# left hand instead of up to B, D.
Wrong on multiple levels. First of all, let's look at the left hand's pattern for that measure (I'm going by the Doremi Music Publishing Co. release which I in fact bought from a sheet music store). The sheet music indicates six eighth-notes: G2, D3, G3, A3, B3, F#3 (the numbers refer to the octaves of the piano). This is exactly the way the original song from the game goes. In your video, you are proposing that the actual left hand pattern omits that B3 and instead moves from A3 back down to G3 (you got it wrong in your description). This is not the way the song goes and is actually detrimental to the music. The interval between B-G forms a minor sixth, a very colorful interval that gives the melody and accompaniment a particularly resonant character, especially considering the piece is touching on G major in a piece in E minor. That's how the piece originally goes. You're proposing that the interval is not between B and G, but instead between G and G. In standard counterpoint, octaves should only be arrived at in structurally significant places. This means usually at the beginning and ends of pieces, or if necessary, the beginning of a phrase or even beginning of a measure. That's because it's the "most consonant" of all intervals in that it's the same pitch, just shifted into a different register. There is no structural reason as to why an octave would be necessary where you put it, which is in the middle of a phrase and the middle of a measure. To my ears the octave sounds like a moment of dullness, where melody and accompaniment no longer harmonize, but got stuck playing the same note.
Later on, you play a perfect fifth between D-A in the bass instead of B-F#. That is also incorrect. Considering the chord that follows it, it's the difference between a retrogression (V-IV) and a more normal progression (iii-IV).
Even later, you play A3-G3 in the bass (after the held dominant chord B major) to lead into Section D instead of B-A. That is also incorrect. A leads more smoothly to the tonic E than does G because G is already part of an E minor triad, whereas A is not.
There are other chords you get completely wrong in Section D, like the dyad A-B in the right hand instead of the three note chord A-B-F#. You're also not playing that A major chord in the right hand correctly; I have no idea what you're doing there or why.
Your version is inaccurate. I have compared your version to the original and you are wrong. I have also compared the sheet music to the original song and it is completely correct, not omitting or recomposing anything as you suggest. On top of that, if there were these inaccuracies you claim there are, people would have found them in the fourteen years this game has been out. Your program obviously didn't get this right.