It's like Super Monkey Ball! 🍌 This concept has so much potential behind it! You could potentially have multiple paths you can take to reach the exit, each with different size requirements.
It's a bit tough to figure out what size to be at for each obstacle, so there's a good amount of trial and error involved. Also, are the different sizes supposed to feel different to control, like having different speeds or jump heights? I didn't feel any differences between them (which I guess can be either good or bad depending on your intent!). The speed boost also didn't feel like it had a lot of effect on my speed, either.
But this is definitely a great entry and very creative, and all made in 48 hours! It deserves many more ratings 🎉