I found the issue for that Bug. Do not select the Critical Attack Node - when it is triggered it cause a NullReferenceError. It is an easy fix in code, but alas I cannot until after the Jam.
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Ah - no worries! Will give it another shot :)
Edit: managed to beat it on all difficulties - great fun :) was definitely very much obsessed with the idea of criticals on my original run, which I'm guessing is why I kept encountering the bug! I focussed on regen abilities this time around, and found they're a great strategy :)
I'm glad that bug fix worked out for you. Thanks for giving it another go. It's quite unbalance at the moment haha - balancing RPGs isn't a 48hr task :P as long as you pump DEF early it's hard to lose and Regen is way powerful with high DEF. Glad you enjoyed it.
I like the core mechanic and think there is so much room to design further cool mechanics/tradeoffs. I think I will spend another month on this one at least after the Jam and see how it pans out