I really appreciate the thoughts VaroClaw!
That isn't the only issue that's been pointed out about the end game, and I tend to agree it would be a better experience leaning a bit more on strategy and less on luck.
The design intent for floor 8 was to create kind of a Mega Man style mini game where each boss' treasure would compensate for one of the other bosses' abilities or strengths.
Hopefully those occasional trial-and-error deaths aren't too frustrating and you'll bounce back on the next dive.
On a related note, I am floored by how positive this project's reception has been overall. The points of criticism have been valid and I feel like it's helped me a lot with my perspective as a dev.