- I didn't really like the gaining power when moving the mouse. I just stood still and flailed my mouse around. Maybe only the pick ups to gain charge to incentivize the player to move around the map. At the end i was just spamming smite on the castle to protect it lol.
- I didn't know what the number did or that there was a shop on the first run. Maybe it should auto open and you enough charge and get to select a power up out of 3?
- Movement should stop after letting go of LMB (already mentioned by other commenters). Smite and move should be swapped IMO.
Overall, you did a fantastic job. It feels polished and was fun to play.