I had a fun time. The highlight is definitely the personality of the banter. However, it would be nice if the player character had some retorts in gameplay like the tutorial. Perhaps the retorts could also serve as helping to visualize the benchmarks.
With the only visualization of feedback being the too high / too low interstitials, it feels like the randomness of a slot machine. Perhaps some additional grading I.e. "a little low" "very low", it would help communicate the calculator