1.
Moleworm can be hammered to collect but also deals damage to them. Once you need to move them (like you carelessly make them leave the pen or you need to duplicate them), if you don't heal them before whacking them they will die. If the burrow is dug then they will permanently disappear. I suppose this is intentional, but should also make them can heal through different ways:
1. Feeding mineral not only increasing their hunger but also increasing their health.
2. They will consume minerals they obtain after going back to the burrow and regain some health. They will not consume gears, trinkets or ice, etc.
Although healing items are easy to get and Moleworm can be duplicated easily, we still can think about this as this will make it more realistic and Moleworm is those minority that can't be healed by food.
Yes they can heal from it. I just don't notice it
2.
Also, I would like to suggest the Moleworm should have something be changed so that they would not stuck in the wall. Even you clear all the minerals left in the ground in nearby, they will still often want to leave the pen and stuck in the wall. If you dig more, more of them will stuck. At this moment you can only leave to wait them calm down or reentering the game. This time I also want to ask, is this unintentional or intentional?
We can make something like if the Moleworms completely stay in the same place for like 15 seconds, they will be forced to change the direction.