I have problems with this.
1. Why are you using Classic Sonic in the loading screen if he's not even in the game? Stop mocking me, Sega! ;_;
2. The physics are too floaty. Sonic jumps too high and stays in the air too long, and the slopes physics remind me of Rush. This is not a good thing.
3. Speed boosters. In general. Sonic 2 had speed boosters, yes, but they were incredibly rare, and only in like one zone. If they're putting them in the island level, this means that they're probably going to be REALLY common, and this'll probably be a hold-right speedfest like Rush and Advance 2/3 were. This is very, very bad.
4. The game looks pretty glitchy. The guy stays away from the speed boosters, so those must cause problems, plus Sonic has problems getting into a loop. Since this is a beta/alpha, I'll look past this, but they better fix it in a way that doesn't involve scripted sequences.
1. As of right now, who really cares?
2. The only time Sonic seemed to jump high in that video was when he went off of that slope, which you should expect to happen.
3. Without the use of that boost, the player was struggling just to get up that hill to the spring, I don't see a problem.
4. Pointing out bugs during the alpha stage doesn't seem very effective to me.