It's a cool concept to use you diging momentum and from two games in this gamejam that went with this concept of digging with a drill, this one is definitely ruling. Alhough I'm not really sure what's happening to performance on entering the dirt!? I drops to like 3 fps and my guess is that it spawns some kind of an emmiter or an object triggering constantly. Either than that, adding more effects, like digging the dirt, particles, animations, squish and squah and overally just j u i c i n g the game out would make it a more enjoyable experience but for what it is I really enjoy it, especially the idea of keeping momentum. The base movement needs some tweaking but overally it's quite solid. Setting critique aside, it's a great entry and honestly had fun playing it and with a bot more polishing and improvements could be a cool lil' game. Nice work on this one!