The game plays very fast, which is great because the dungeon is huge! :D
I used the map on the game page because otherwise it was just unplayable for me; I had no idea where to go or what to do, at first I thought it was just an endlessly procedural mineable dungeon. But then what I thought was the bedrock border was actually a maze and it opened up to a new area. That's the point where I gave up and I looked up what to do. Didn't even find the statue room before that lol.
Combat felt a bit bland, the hammer attacks very rapidly so the skellybois die quickly. Exploding bombs are also easy to get rid of, they take a long time to explode. I never felt threatened while playing this game and lost only a few hearts over my entire playthrough. Explosions are nice, especially when you get a chain reaction from multiple bombers :D also I loved the details and easter eggs in the starter room!
All in all it's a solid game but it misses some more fun gameplay elements, I think. It's quite hard to say what those would be, though, but it probably has to be something that works well with the bombermining.
Anyways, good job! :D