Sorry for the confusion! Due to time constraints, we had trouble completing the tutorial, so not every mechanic was stated. However, for going underground, the mole has to hug the border between above and underground before you can press space to burrow. Pressing "i" brings up the inventory, and holding right-click while the food is in the inventory slot allows you to eat. While it is a bit hard to do, the mole can build as well, by finding an empty tile and right-clicking. We will update the description to avoid future confusion. Thank you so much for playing our game!