Vigeland certainly had a distinctive personal style, and this park is a showcase for his sculpture.
I am reminded somewhat of Gaudi in Barcelona, but Vigeland specialized in sculptures of basically human figures. I say basically because many of them are very stylized: twisted and fused in odd ways, blended with animals, apparently juggling babies etc. (The latter definitely a bit weird)!: I have to suspect that he was psychologically... well, somewhat out of the norm.
Not classical sculpture, and some of it perhaps a bit disturbing on certain levels.
But at least the park is free, so you can see as much or little as you want to!