Thanks so much for the feedback! I'll address some of your points, but not to push back on them, they are all valid!
I tried to make the upgrade screen non-interactive with a "fade in" delay, but I agree that the delay is probably not long enough - especially using a mouse it's easy to still accidentally select something.
Balanced Blade is indeed bugged at the moment. I unfortunately didn't discover this until after submitting, but I do intend to do a slightly more polished version at some point, while leaving the "bootcamp" version up for posterity
You also indeed discovered a bug that only happens if you make it to the final arena and restart
Lastly, your advice about telegraphing attacks in on-point, and in line with notes I had made for myself. If/when I continue to polish this those are certainly things i plan to address.