Trying to get the number as close as possible with random dices and math operators is a really neat concept, and I feel that it is executed pretty well here. Very satisfying especially when exponent is used for getting to a number that requires multiple steps when using other operators.
I don't think I agree regarding your comment on discord that its "just a glorified calculator". I think its, at the very least, a huge step ahead of "menu simulator" as a battle system you see in most other turn-based games. Personally feel that it has a huge potential and is definitely worth expanding upon.