Tell me in detail how this plays like a Mario game, because I've played it too, extensively, at two separate events. While the game certainly has some visual similarities to Mario game, the game play is as different as it was in the Genesis days. Sonic's much faster, the levels are much wider. Parkour completely changes things up, allowing Sonic to run along every surface. The stages are much bigger and many of the spherical worlds have multiple paths to move through. The way Sonic dispatches enemies is completely different from Mario. None of this stuff is in a Mario game. Mario's ability to cling to surfaces is limited to a wall jump, hardly comparable to parkour manuevers.
The only similarities is that they both run and jump, which has always been true, and that Lost World's spherical stages have a very similar look to Mario Galaxy. But VISUAL similarities in a video game only matters so much.
And that's just the 3D platforming stages, not taking into account the auto-run speed stages, which Mario has absolutely nothing comparable too.