Cool game! I like the premise, but thought it could be more exciting, like maybe something chasing you :) Things I would add: an in-game indicator that the maximum radiation is 10 (like it will say 1.34/10), and some feedback like a sign that shows me that when I hit the level, it took a rock (I couldn't tell at first). The rock also sometimes fell out of my hand, not sure if a bug or intentional challenge, and finally the hitbox for the pickaxe to break rocks was pretty specific and hard to find. I do appreciate that the goals of the game were easy to understand without having to read too many instructions. Good job!