The Armon HP Glitch was a glitch that was caused by the Church of Defolgy. Given enough money, you could decrease your max HP to 0. As of Version 1.55, the glitch has been fixed.
By donating to the Church of Defolgy, Armon increases your ARM while decreasing your maximum HP. If you donate enough, you used to be able to reduce your max HP to 0 or less.
Unless you are in the second area, have beaten the three bosses of the second area, and are very, very lucky, you were unable to beat the game. Any battles you enter cause you to instantly lose, and it appeared that Skill Checks auto-triggered and auto-failed, also causing instant Game Over. Also, due to instant defeats in battle, the only possible ending is the Really Bad Ending, if you even last that long.