A few items have been updated in the demo:
(1) Slimes now randomly spawn Minor Healing Potions.
(2) You can press the character G to say "Good Day" to an NPC. If you are in range of the NPC, the NPC will respond to you.
In future game updates, (2) will be critical for briefly stopping an NPC when they are going about their daily business. You can then engage in a detailed conversation. And naturally NPCs will like it when you talk with them.
:)