Ah i see, in that case. i think it could make more sense where you could go to 0 biscuits, but if the dog comes while you have 0 biscuits you insta-die, but i could see it going either way. as for the minigame, i think it would feel more enjoyable overall if you had to do minigame to start the baking process (maybe 3 to 5 seconds) then it auto baked cookies for an additional period of time so the player can go do other things, spend resources, repair, or you could look to add in other things for the player to do. on top of that the mini game could have varying difficulty for that short period of time, resulting in lower or higher amounts of cookies baked.
still fun and nice work!