I'm normally not a fan of games with this kind of animation but I'll be damned if you don't get your money's worth. Would love to see this picked up again or the developer making another similar game.
There is HS Tutor from the same dev.
Actually I think that's the main challenge for that dev: HS Tutor is very different from Solvalley School, and while there may be some overlap I have the impression that a large part of his audience enjoys one of the two games way more than the other one. It can go either ways, for me it's Solvalley, I loved the style/crazy characters.
What I think he'll try to do with his next game, is something that reunites SS fans and HS Tutor fans, to please both audiences. That's my theory at least, I may be wrong.
Anyway, personally I never found another game quite like Solvalley. There's a uniqueness to it.