I thought about making the enemies zoned, but due to the fact all of the levels are tilemap based that ended up being more challenging than expected to implement. Killing enemies through the wall is known but I didn't feel that was *too* big of an issue and fixing it with a raycast or similar was not particularly easy to implement.
I did want to make a menu or tutorial but sadly didn't get around to it, maybe I'll expand it a bit more after the jam is over depending on how well it was done. I'll add what is mineable to the description, thanks for that feedback!