This was really fun and has smooth gameplay but It was actually too easy. On my first try I got to level 49 and my hearts covered past my level up bar. The only reason I died was because I flung myself really high on the left and got stuck of screen. More types of enemies or even a boss every 5 or 10 levels would be great. It would also be fun to use the drill as a mining tool for ore in the ground for possible upgrades. Well done.