It's a fun, silly game. The tone is light, the world is colorful, the spell combinations CAN be fun, but I'd say if you don't intend to play with another person it's gonna get real old real fast. I played it solo at first and it was okay, but it wasn't something I stuck with. Then I found a bro to play with and holy hell does it get a thousand times more fun.
The big change comes in synchronization. Coordinating with your friend, going "yeah I got a rock ready, freeze him" or something, and then pulling it off. That's satisfying, it's a lot less satisfying when you have to freeze him yourself and then rock him yourself, or whatever combo you decide on.