Great and polished suika game! The legenda and the setup for the game make the game feel complete. I also disagree with some comments, as dropping the balls randomly did not seem to get anywhere near the tally I would get if I placed the balls strategically. So that seems to be really well balanced.
The graphics are great, but it gets quite hard to distinguish the spheres from another and it gets harder to understand which spheres match. Especially ones the sun is dropped.
Apart from the polished suika game, I do have some issue with the limited shapes constraint. There are definitely only pentagons and circles used, but the actual gameplay is all build around a cube, where the spheres fall into. The UI and everything else works great with the limited shapes, but somehow having the pentagons in this particular setup feels like avoiding the actual limitations of the shapes for the gameplay.
I was going to suggest having the bases of the pentagons hollow, so that balls can fit into the spaces. I do realise that that might cause the start of the suika game to be repetitive, as all the balls will slide into the pentagon, rather than a sturdy base.