Small fixes from feedback

I've made several changes in the game. Firstly, I added a particle effect to the key to make it easier to spot from a distance. Additionally, I introduced a widget in-game that appears in front of key elements, indicating they can be interacted with.

Next, I attempted to address the issue with the pause menu causing bugs on some computers. Although I'm not entirely sure why it's causing problems, I worked on finding a solution for it.

Furthermore, I updated the animation of the main character and replaced the in-game music.

I also resolved a glitch where the character could run even when they shouldn't be able to.

Lastly, I improved the riddle involving symbols on the walls and the door by implementing an automatic reset feature. This enhancement makes it easier to determine if the combination is correct or not.