Such a smooth and fun game! The graphics are extremely nice and polished, and the music is a pleasant jam that's easy to listen to on repeat - you did incredibly with them for the time span! Descending felt very smooth and natural, and though I didn't realize you were supposed to use the shafts to get back up the first two times I descended, I pretty quickly realized there was a way to get back up to the top alive. The town, the rabbit, and the combat all have an excellent charm to them, and I could absolutely easily see this being moved to a phone game or something of the likes - it's very satisfying to play!
I did wish while I was playing that I would get the resources from whatever the bombs blew up - without that, and given I could mine through blocks about as fast as a bomb could explode, I almost never felt the need or desire to interact with them, and they were never blocking my path so wholly that I had to. I think allowing them to drop the resources from the blocks around them would cause more incentive to interact with them, causing players to have to wrangle with them more.
I also ended up not interacting with the combat system much for the same reasons, given there's nothing in combat for you to get that you can't get while mining already - it was an absolutely charming system, and I'd love to see more incentive to use it either through unique drops (or enforced entire lines of monsters such that there's really no way around them!)
The torch and pickaxe upgrades also felt really good to use - though I had no concerns getting to the bottom after getting the second tier pickaxe, I absolutely kept playing until I got to the top tier just to see how fast it could go! they were really rewarding trees.
Maybe it's because I didn't use combat or bombs much, but the other trees felt much less impactful. What I would have loved to see would have been a finalized upgrade to the bomb tree that made you immune to bomb damage so you could, after enough upgrades, mine through them without a care.
Ultimately - excellent work! It's a beautiful game that's very enjoyable to play, and though I understand where it needed to end from the perspective of a game jam, I found myself slightly sad when I got the final upgrade that I couldn't pick through the bedrock at the bottom of the mine for ~secret bonus content~ - I'd love to see that implemented some day! βββββ