Came back to this game this week, and got pretty significant improvement in just a few days! I'm not entirely satisfied, so I'll probably end up coming back to this some time in the future, but I'm happy to get a decent standard run for now, given I've run this game for less than a week.
Note: This is the 2013 remake of Sonic 2, that was only released on mobile.
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Speedrun profile: http://www.speedrun.com/user/werster