I love the frog art, and see what you're going for with this. After a few runs of engaging with the locks and rerolls, I just started spamming "submit" as it was efficient,. I maxed out a few upgrade trees like this, but otherwise didn't know what I was progressing towards? Is there an end?
I think, like in luck be a landlord, persistence + RNG will just yield this kind of spam farming behavior. I feel like if I had a bit more decision making power, and had to make it to maybe a certain depth within "x number of extractions," I would have engaged more carefully with the decision making and push my luck mechanics.
Also, RNG works best when there's like a lot of random going on, like a match 3 board. This ensures you almost always have SOMETHING going for you in your current results. In this iteration, it's too easy to roll twice and just not get a pickaxe. Maybe consider a bigger, modern slots style board? like a 3x5 grid or something? In any case, nice work, and I hope you stick with it. Push your luck / rng narrowing games can be quite fun and I like the "dig deeper!" theme!