I would make the opening area smaller. I know that you wanted to make the place big but the doors just turned me off. Even if you don't check them it is a lot of wasted time walking. (Which is ironic since my game has many doors which don't do anything.) I did wonder if I was hitting the enemy. I didn't notice anything to indicate I hit. Nor do you have your health on the screen.
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Thank you so much for your feedback!
About the health on the screen, one of the controls mentioned is pressing E to show/hide the HUD. That should make visible the HUD that shows the player's health on the top left and enemy health on the top right. My mistake though, I should have made it visible by default.