Great concept and environment! IMHO I think the clicking mechanic should be a lot easier to do. Usually in these types of games, the only hard aspects are figuring out what do next, plan for, and learning the UI. Getting the player to precisely click on a very small/tiny circle may be too much. You could expand the clickable area and hide it with some extra particle effects/texturing. I would say maybe grant an ability to hold down the mouse to sweep over areas. Just some food for thought. GJ!
Edit: Just realized I was using the high speed settings on my mouse so maybe that also factored into how hard it was.