Thanks for your feedback.

Correct, you can only bring 1 key.

In early design I try create like only 1 combination that can bring you move to next room. And each level will increase number of false key or door. And I didn't make it random generate labyrinth.

In current design I want to make it random generate labyrinth. But I found it really difficult to play in higher level, first you need search a path, and found correct key (you didn't know which one is correct key), looking for correct door and avoid ghost. That when I make it only 3 key and 3 door, you can use 3 combination to move. And I change into color key from number key, so player can look from far away. That why I use only 3 (RGB).

But I like the idea using 2 key to open the door, like purple door need blue key and red key. 

Thank you for the feedback.

I design the ghost to get more transparent if it have shorter distance with player. And if the ghost see player it will stop 1 second and attack with high speed. In last update I change the color from black into more white so player can see the ghost better too.

Wow, I'm happy to hear there more people who beat the game. Congratulations you beat the game.