Trying to test the new content, but the exchange doesn't work and neither do the first 2 star upgrades. I can't click on them. I believe the hitboxes are either not there or too small to click. I say this because the last 2 star upgrades were usable only if my mouse was on a single pixel, same with the shop menu tab and crystal upgrades. The click boxes are way too small and only on the very left side of the buttons. Also, the "Assign" buttons for work after lvl 1500 don't work.
Just tried. Both shroomed up, 14 dragon shards for Assassin, 12 for Golem, the price is now about the same, maybe I could put Assassin at 15. But Assassin's DPS is e80, while Golem's is e118. I didn't expect such a big difference, but my first choice was right :)
Now I need 1.1e6 shrooms for the best upgrades and earning 4e4 per reset at lvl 1600 :(
Edit: actually the Wizard is the best when you can buy him his last upgrade. He has a total 2000 multiplier. Phoenix will be the best DPS as soon as I can get him lvl 1000: 11250 multiplier.