Is there a difference between each totem? Maybe the totems you invest in could alter the shape of your cursor, or the one with the most valuable pieces could give you a special effect, like projectiles.
You may have to figure out how to keep players from just hovering over the center of the arena once they're powerful enough. Felt like the fast ones weren't worth chasing because they reached the edge so quickly, and whenever I left the center to catch one that escaped, more escaped from the center to punish me for straying.
I like the concept. Looking forward to seeing where you take it.