Hi, thank you for the comment.
This is not a game about finding keys; it is a platformer/puzzle game, though currently, it leans more towards puzzles. The part with the key is just one puzzle related to exploration. There are no bugs there, and the last two keys are hidden but not difficult to find if you interact with everything in the room.
However, I have taken into consideration what you said and added a particle effect on the key to make them easier to find (no light, but the effect is significant enough). There are eight keys in total, with two hidden behind the statue. I've implemented a feature where when you're close to the correct statue, a message appears, indicating that you can interact with it, which should make finding the missing keys easier. Initially, I hadn't planned on adding this feature, but I thought it would be beneficial.
Since there is no UI for the key (intentionally), I wanted to ensure that players knew they picked up something, hence there is no collision when picking up the key. Additionally, you will encounter keys later in chests, which require the interaction key to pick up.
Regarding the pause menu, I've made a few changes, but I'm unsure why it would cause the game to crash upon resuming, as it's simply a UI disappearing. I've uploaded the game with the mentioned changes; it should be easier to navigate now.