Thanks for playing and taking the time to comment! I'm glad to hear you enjoyed the graphics and music, our artist and music producer popped off! As for the game being slow, if we were to iterate on that in the future, would you like to see fewer waves of enemies, less time between waves, both, or something else?
I would say that having more enemies popping out more often would make the game more dynamic. That would mean to lower the HP of the enemies, but overall the challenge would be the same as more enemies would still drain the moon mana.
I remember watching a variant of the classic "Juice it or lose it" YouTube video that was applied to fighting games where they explain how having more weak enemies more often makes the game more engaging for players, but I can't find it right now :-)
Maybe the "Secrets of Game Feel and Juice" video has something that can help for this game.