Click the enemy in the center of the screen. Then, once you have enough geo you can upgrade your charms, which will provide useful benefits. There are currently 8 levels. Left and right arrows to go through page to page. If you have enough soul you can press V, which will inflict damage to the enemy. Vengeful Spirit costs 150 soul. ~Charms~ Soul Twister will decrease your spell cost by 5% and can be purchased up to 5 times Nailmaster's Glory increases click damage by 1 Unbreakable Greed increases the amount of geo you get by 15% Shaman Stone will increase your spell damage by 20% Thorns of Agony will increase your DPS by 1 Soul Catcher will increase your chance to get soul per click by .83%. King Soul will give you 1 soul every 2 seconds per upgrade. Gathering Swarm gives +2 geo(per level) everytime you cast a spell.
~Updates~ V1.0 beta: Hollow Knight Clicker is released! V2.0 beta: Adds Shaman Stone which increases spell damage, adds level 6, and changes a few other minor things. V3.0 beta: Adds Thorns of Agony, which increases DPS. Also adds level 7. V3.1 beta: Fixed a bug. V4.0 beta: Adds Soul Catcher and adds level 8. Also decreases Shaman Stone's cost. V5.0 beta: Adds King Soul. V5.1 beta: Changes Nailmaster's Glory to 6 geo. V6.0 beta: Adds Gathering Swarm, changes base spell damage from 20 to 30, and decreases the cost of Shaman Stone to 8 geo. ~Credits~ Team Cherry for Hollow Knight Christopher Larkin for the music Inspired by Clicker Heroes by Playsaurus