5 stars: Great presentation. I love the high resolution, the widescreen aspect ratio (that fills up my entire Galaxy S22 Ultra display!), the quality of life improvements (including saves and spin dash) and the extras (including Tails and Knuckles as playable characters). Just beware that if you have a 120 Hz display with adaptive refresh, you might notice some stutter. I switched to 60 Hz, and now the game runs smooth as butter.
3 stars: Good port of a classic game, but I find the position of the controls isn't very ergonomic. When I hold my phone in landscape orientation, my thumbs naturally go to the top corners of the screen - this must be fairly common (see position of controls on handhelds like Nintendo Switch) and it's frustrating that whilst the position can be adjusted, movement is limited to the lower quadrants.
2 stars: Nice attempt, but touchscreen controls will never even come close to a controller, no matter how hard you try. Played 1-1 on my Genesis, completed the level with ease, then tried 1-1 on your port and could barely manage to keep Sonic moving in the right direction. Please stop trying to port the classics to touchscreen devices, it'll never work right. I'm uninstalling this.
2 stars: Was excited to play this and downloaded it to pass time on the airplane only to find out that you need constant internet access. Then I couldn't play again on public transport because it depleted my data. Seems like an interesting rendition of a classic but po...