Great job! It is very impressive that you made this large of a game within the 4-day period. I enjoy the time limit as an added layer of difficulty, and I wish it didn't become obsolete so quickly in the late-game. It took me a few rounds to figure out exactly how to get ore, so I would recommend adding a tutorial or at least something noting which block it is, as I just thought the ore blocks were extra-hard blocks. Once I got past that hurdle, though, the game was really fun and I loved using the bombs (Unfortunately even 4 bombs could not break the bottom of the map).