Yeah, Grizzly Grandpa is definetely better. The problem with rocket boost is that it actually has big potential to synergize with riding, but is used for flying with sudden turns and spikes, and in that situation it doesn't control well since it's a bit hard to aim.
Awesome, I’m glad to hear you think that’s an improvement. I think I understand your critique better, I have some ideas of how to tweak the level design.
If you’re curious, my level design philosophy for is kishotenketsu, outlined well in this video about Mario 3D world design: https://m.youtube.com/watch?v=dBmIkEvEBtA
that type of level design works well when introducing new mechanics like spring, rail, and grapple in first 3 levels. But the rocket booster needs some special care — as you said, it synergizes with riding well. So it shouldn’t be treated as an individual mechanic, but as an addition to what the player has learned already.
Thank you so much, this was really helpful feedback. I will playtest your game soon!