I had a lot of fun playing this! This was such a fun take on the theme, and very unique way of balancing a Health and Mana system.
Even though the Mana converted for an overall gain in Health, it somehow didn't feel too broken or cheesy to take damage, heal it all up, then damage some more to restock on Mana. It was a fun balance to juggle along with the solid FPS Mechanics. I enjoyed the music, the art, and overall had a blast playing!
Very well done!