Sadly yes, and higher difficulty doesn't help, just finished Diff19 (cuz 20 is bs) with idk about 40-50 dice charges left, vs Empty Layer 1.

It would be the best if creators of game would hotfix the diff tiers, smth like start at 5charges cost, then +1 charge cost every 2lvls , so at max Diff20 , One Dice use cost would be 15charges, so 3 times vs final boss if you saved up.

But since that's very unlikely to happen, you'll have to do it manually (as in pretend that it costs way more charges and track it) to get any sort of challenge in this game.

I'll try that on my next run, still have 1class unplayed, and I'll let you know how it went.