A very fun game. The dinos are all well designed and their abilities read well. It could be go to have the ability to change the controls in the pause screen, or more information on why you have 4 different versions of the controls. Mainly because if I wanted to change the controls for one, it might overlap with another, and there's not an easy way to just turn the other sections off, as well as they didn't want to change properly, sometimes booting me out of the controls menu. The other thing would be the platforming with the glide/dash ability. Getting up to the floating pool with the two coins is pretty tough because there's only a 1 tile platform to land on when jumping from the mushroom, and it's on the next screen, so being able to react well enough to land there is hard. I know it took me at least over 5 attempts. If you ever go and fix it, it might be you want to change that first one to be a bit wider so there's more room for error. And I think the last thing is Olaf breaks a little if you suicide while off of him, which can leave you trapped unable to jump high enough to get to him.
So other than those three small things, everything else is great! The idea works well with having one dino that gets the other powers. The graphics and sounds fit the vibe you're going for. The scroll on the screens is smooth, and it's clear what you need to do in each area, at least to me. The slow movement in the water makes it feel tense as your air bar depletes, but not too much. Overall a lovely game that could use a little bit of polish, but works fine nonetheless.