This is inaccurate to real MSX/SG-1000 in one very important thing, a quirk that real TMS 9918/A hardware had. Real VDP / TMS 9918/A could only scroll in increments of 8 pixels / 1 tile per each scroll instance. Here the scrolling is smooth like in NES / Master System games, one generation later.
Except for that, it's a great game.