Does not sucking count as a gameplay feature?
The closer you are to Sonic 2 the better. Seriously though: Good physics and level design are the most important things. Feel free to throw in some cool pretty much automatic nice looking bits but everything else can wait. The "features" of each level should emerge from your level design, not the other way round.
The closer you are to Sonic 2 the better. Seriously though: Good physics and level design are the most important things. Feel free to throw in some cool pretty much automatic nice looking bits but everything else can wait. The "features" of each level should emerge from your level design, not the other way round.