Hello GreenClover. I am glad that you liked the game mechanic.
Perhaps you did not touch a blue square that will teleport you to the heart that you were looking for, or maybe you did not kill all the monsters. I assure you that I have play tested level 2, and it works as intended.
I appreciate the feedback about the gun control. Perhaps I can add a marker that can assist the player in aiming when refining the game.
It would be much appreciated if you completed game and give more feedbacks, it can help me be a better game developer.