Pretty sure this is close to the infinite build just didnt want to take it any further. Not sure what the mathematical limit is but i recon this build would get you to wave 200 at least with the exception of maybe a boss round. Average spin generates around 1500 dmg and 1500 arm. If anyone wants to attempt it, i would recommend swapping the blue balls for all yellow as the blue balls become useless in later waves and pick up the higher arm and attacks along the way. The way this build is right now it either clears on first spin, or max's your arm first spin and you clean up on second spin.
Also if the dev reads this ehre are some bugs - 1. you can start spinning the wheel going from the end of a stage into the shop and then from the shop going into the begining of a stage. It doesnt effect anything. 2. At least in later levels it seems like you have a count down timer after the last enemy is killed to then process the shop, however if all the balls have not finished their calculations, and after the arm goes to 0 if there is still balls calculating you can potentially get arm while sitting in the shop which carries over to the next round. I would move the "remove all arm" function to the start of the round instead of the end to ensure its always cleaned up. Fun game though and cool concept.