This brings back memories of my childhood self playing Super Monkey Balls on a GBA. Ah memories. Thanks for that! I think the game has a certain charm that I really like, probably the low-res art style or the gameplay, and I think both of them make the game quite enjoyable to play. Rolling through each level is fun yet quite challanging, especially in the latter levels. I'd say though, that the last two levels are really hard, and the janky physics frustrates me a bit. Imagine being thrown to the sky so high that you can't really see where you are going. I would suggest tuning down the moving speed of the platforms a bit, as I don't think the engine can handle that. Also, as much as I like the low-res style the game is going for, I think you shouldn't apply that to the text as well, or at least choose a font that also looks good in such a resolution. I struggled to read the text on the screen for most of the time, and that's not a good look for the game.
Anyway with all that's said, this is a very nice entry indeed! Well done!