Wow, you put a lot of effort into the game. It reminds me of Terraria/Starbound.^^ The digging is sometimes a bit glitchy. Are there some kind of invisible obstacles or barriers which can not be destroyed?
Thanks! No the colliders are just a bit buggy, creating 2D colliders from a procedural mesh is actually more difficult than for 3D games somehow. And there was definitely not enough time to make that work perfectly.