It works and it's easy to use but I don't understand the purpose of making the game harder. I see the video you are fighting one of the lowest levels in the game with a Premium character who is levelled up high enough that they would make short work of those enemies anyways. Testing it in other places here's what it does.
- GM: Your character kind of recovers more than they would normally if they have that ability. This doesn't help pass levels. Which again you would pass that Level with Luna ranked up that highly without breaking a sweat anyways.
Challenge in this game is dictated by Time + Amount of damage done to enemies. Being able to do X amount of damage before the clock runs out. What would be cool is if anyone made something that stops the clocks. Pretty much anyone could beat any level than by just being able to shield up and dole out enough damage.
- Dummy mode: Outside the level in the video which again the enemies were too low to damage the player character, Luna, anyways, this does two things: Kill your player instantly/makes boss, the characters you need help beating, invincible. They become frozen on their last line of life and you can't end them. I tested it in pretty much every mode of play. Basically once enemies have any resistances you lose worse than you would without a mod.
Nice coding, really beyond me but I don't get the purpose of this mod.