Granted, Sonic 4 would be more fairly priced at like $10, but anyone who thinks that a Sonic game is going to be a long adventure is just not thinking straight. Sonic 1 and Super Mario World came out the same year, and Super Mario World is by far a much longer game. Yet they cost the same price. Sonic's about replayability people, not long epic adventures (Which is why I welcomed Colors and Generations with open arms. They got rid of the shit that plagued down 3D Sonic games and made them short, sweet, and to the point with plenty of fun to come back to).
I know this, but 4 stages is undeniably lazy. 5-6 should be the bare minimum, I am pretty baffled as to why they went with such a low number when Dimps have produced average-sized 2D Sonic games in the past, such as Sonic Advance and Sonic Rush. I'm hoping that they'll release one more episode simply for the sake of having a normal sized 2D Sonic game again (8 stages + 2 boss acts).