Like one of the previous commenter, I got stuck in a wall and the demon just killed itself even when I was out of health haha. I would've liked to have some sort of animation on the player when you use the shield, I wasn't sure if it was working until I noticed the blue bar at the top.
Having the demon destroy the TNT bars(?) in the losing screen is a smart choice to teach the player what they're supposed to do.
I'd also like to hear more about the game's connection to Buddhism. Besides the title, I couldn't tell. Is the demon or the player character inspired from Buddhist mythology..?