First of all - great job! Simple yet fun to play and great music. Challenge/leveling is balanced very well early and mid game. However, late game it gets much too easy too quickly. Once you have a majority of the tree talents you can kill most baddies before you even see them on screen. Suggestion is to make leveling past 100 much tougher. Even with exp bonuses players shouldn't be able to get 30+ talents in a single round.
Thank you so much, especially for the constructive feedback!
I'm actually working on adding a bit more structure to the runs at the moment, turning it into a finite length experience.
Currently the run will end after 20 days, meaning the builds won't be able to get quite as insane but you'll still have plenty of time to explore options.
After completing a run you'll be able to increase your mastery level which adds a new layer of difficulty (new enemy types, less player health etc.).
Hopefully this will let less experienced players dig their teeth into the talent tree while offering a serious challenge to players who want to push the game to its limits.