Thank you very much for the feedback!
Haha, I've gone through four or five different control configurations and I can't seem to please everybody. I think the only way to make everybody happy is to just have a TON of options. I will add more control options in the next version.
Great idea showing a hovering context-sensitive button over objects you can interact with! I'll definitely add that in a later version, along with a better icon representing locked doors.
Good catch on listing all of the controls! I will update that as well.
I agree - I would also love to have more enemies and have them come in waves, but those ideas extend past the original scope of the game I set out to make. Fear not...these additions, and more (such as different weapons and realistic lighting) will make it to the sequel