Hi thank you for giving such critical important feedback!
Accessibility is important to me and there is a learning curve so i have done my best to improve on what you mentioned.
I have updated the WebGL Version with a brightness button and fixed the scaling of HUD elements. Please let me know if this improves the gameplay for you :)
To get the key you have to go back to where you picked up the hammer.. interact with the forge to make the key :)