My only suggestion after playing a bit more: I'm not a fan of "gain X per unspent prestige point" because it's kinda an anti-fun mechanic and I just want to spend all my prestige points (maybe make it based on lifetime earned points?). Otherwise great overall.
Thanks for playing. I agree with you on the unspent points thing, I've changed it now to be based on total points earned instead. Thank you for the feedback!