Thank you for the feedback. I updated the description and also uploaded a video demonstrating the intended experience.
Admittedly, I made a big mistake putting in unclear and even downright wrong instructions.
The orange bar below the blue MP bar is a charge gauge. Some of the attacks required charges to use. The player can gain charges from attacking. Once the player gain at least 25% charges, the "charge mode" can be activated by pressing the "I" button, the charge gauge will turn to green as an indicator. Press "I" again to deactivate the mode. The purple color indicator was added so that the player could use their peripheral. During the "charge mode" if regular attack command is pressed e.g. D+U, then 25% of the charge gauge will deplete, and the player will execute a more powerful version of that regular attack. Another note is that the MP regeneration rate will drop drastically if the charge gauge is high.
The yellow bar above the player's head is a heat gauge which will increase the damage output up to x1.5. The player can gain heat gauge from attacking and will deplete as the player idle.
The reason enemies have quite a lot of health is to make up for the potential damage multiplier which gradually increases up to x1.5 if the player can maintain the heat gauge. So, it is possible that the player could finish the game within 90 seconds or less as presented in the video.
Again, sorry for the unpleasant experience, I should have put more time in explaining the mechanics and added a show casing video before submitting the game. Though, I would be really grateful if you could watch the video and perhaps give me another chance and provide feedback based on the video or even another play-through if you would like to.