the Knuckles at the end screen seems to be Wecknea, a glitched tails who's graphics were overwriten by Knuckles' sprites, making a gray, red eyed knuckles. His ingame name is "**********"
we can tell how fed up you seem by the constant retelling of this story 💀 this is just the original Sonic.exe game but it looks better, and sounds slightly less worse. although there's an apparent overuse of bitcrush. at least there was some effort put into it unlike many other iterations
2:50-2:58 i have a little theory that tails held those rings (from wherever they came from) to try and use them as an extra hit to survive, but they obviously didnt work
2 things a sonic.exe game needs: controller support and mouse support in the settings and 2: the first level hill will be replaced by green hill like sonic.eyx