Thank you very much for the feedback.
Bug 1: I downloaded again and it works for me. The chest is buggy - yes. But when it swings open, you can pick up the gun without problems. Did you take the backpack before, like it says? ;)
Bug 2: Didn't realise that before, but seems like the UI isn't in focus after the restart, gonne try to quickfix this.
PS: Gonne look into your game again ;)