I've been waiting for an addon that does this for a while! It's mostly accurate, but there is one thing that needs to be improved. I was playing Sonic 2 and comparing it to this, and I did find that airdrag takes longer to slow you down to base speed if you were going very fast, like going off a red spring in Sonic 2, while this feels like it's still pretty fast with how it slows you down. I'm not sure if this is totally accurate since I didn't test in Sonic 2 for very long.
