Thanks a lot for feedback, I appreciate honesty a lot more than the comments where people write only nice things just not to offend developer.
By now I recognize that the keys are very frustrating to search for but couldn’t really come up with a solution to this. I initially built this huge building and only later realized that it would be too hard to find the keys so I tried to implement sound signals and this screen blink thing but as I can see now it wasn’t a 100% solution.
I don’t know about the monster, it is really hard to balance him because I’ve seen people who have no problem running away from him and also people who are too scared to even try to run or hide, the main problem I see is that people don’t really know what they should do and how they should play.