Of course!
I often play demos of games and get bored, just because of the unengaging design. This game is so simple, yet so captivating. Enemies would be amazing, I just think that they shouldn't just be monsters who walk back and forth in a little chamber in the ground. I'd love to see creative enemies, like leeches, or vultures, or moles that dig around freely.
More weapons would be awesome as well. Looks like you really know what you're doing. I can't wait to play it! Thanks for reaching out!