This just dawned on me: the game had an alternate dimension which contained not only a tomboyish princess that's portrayed as Sonic's equal but also an Eggman that's more outright evil & calculating than the normal Eggman. IDK, just struck me as an odd coincidence. Like maybe they originally planned some DC-level continuity crossover of game Sonic teaming up with comic Sonic or something.
On a side note I found out Eggman Nega can't legally appear in the comics for unspecified reasons. Weird.