Controls!
This game is essentially a re/hash of sonic 2 with slight modifications. In terms of level design it is not bad, but has some intensely frustrating sections, made worst by the horrible controls. D-pad should just pop up where your thumb lands so you cant slip off it, and the jump button should be bigger. Also, tilt sensitivity should be a setting; the chaos emerald levels are stupidly hard.
Swatino about
Sonic The Hedgehog 4™ Episode I, v1.2