you are the green hearth,you have to project the heart .use arrow key to move.I challenge you to survival in this game for 5 min.The boss sometime will summon some diretion attack at random location then move to the boss,if you tuch the attack it will drag you to the boss and attack you,so when you be drag by the boss you have to run away from another direction.The another attack of the boss make you lose hp
I get ideas from a game name undertale