Well dimps are the developers of the Advance series so they obviously know how to program a 2D sonic game. Wonder why they just dont update that engine
The Advance games were made nearly a decade ago by a different development team, with all three games released within the same time period (within 2001-2004).
Originally Posted by Palas
And no, Sonic's target audience wasn't "children" [during the Genesis era]. ... [The] thing is that Sonic was more supposed to be an universal icon than anything. That's what mascots do. If the games attract children, there's nothing that can be done - but, nevertheless, Sonic as always aimed at people that want to play games.