I enjoyed the graphics and the sound based feedbacks, the gameplay is a bit rudimentary as it is, adding a way to spend your hard earned money on gameplay upgrades should probably be one of the next goals
there is a lot of bugs, some more annoying than others, you can shoot bats with your bow when they are behind you, the "end of level" trap door sometimes block the path even tho they don't look as big as they really are(made me lose a key), you can't pick up bombs, and ores that drop from rocks that spawn on you needs you to get away from them and then go back in to pick them up (it happened right at the start for me, so I didn't understand what they were for until I randomly went back sometimes after)
from a game design perspective, I would probably try to make the use of the pickaxe more dynamic, it doesn't feel super great to have to completely stop to hit in my opinion, and it's not very effective against bats either :)
but overall, I enjoyed the experience, I would like to see more of it in the future in case this project is going to be worked on :)