Didn't play Lost World in a very long time but just the idea of a running button in a Sonic game, idk I'm not fond of it, I prefer gaining speed progressively without having to press a button, and then eventually use a boost button to go even faster, even if how Sonic games are currently evolving, I'd prefer if the boost wasn't an absolute necessity to go fast, even if I can understand why they do that. I think I'd prefer if you could actually keep the boost's momentum which could also bring some strategy in how you use your boost, it could be interesting for time attack