Hmmm, this is a really rough one for me: I definitely think it's a solid prototype for a NG Wolfenstein 3D type game, but at the moment it's lacking a lot of crucial touches to make it fun and exciting.
Don't get me wrong, I think that the game in its current state is very impressive. It's got all the necessary mechanics for a decent shooter in place, and I love the presentation with old-school DOS/shareware menus and such. Definitely some kudos are deserved for getting this skeleton into place that you can improve upon.
But yeah, while the core engine might be there, the game is seriously lacking. First and foremost are the obvious things: there's only one level, and its very boring because it only has one type of enemy and the same graphics plastered everywhere. Even Wolf 3D would shake the levels up a bit with different enemies and different props/walls such that it didn't feel like a bland maze and had some actual landmarks. But moving on from that, what I definitely felt was lacking was the shooting feedback. While enemies would die in impressive ways, I hated how they would not react to being shot/taking damage: made it confusing to tell if you were even hitting them at all (and in fact, sometimes I didn't hit them because I hit a wall corner off to the side, but without any puffs of smokes or bullet holes, there is no way to tell). Getting pickups like ammo and armor off the ground was bad as well due to awkward hitboxes and a lack of feedback: need a screen flash or a sound at the very least. Movement also felt pretty stiff and lifeless. Also there is the issue that it is pretty much just a Wolf 3D clone, and doesn't really bring anything new and exciting to the table: I always felt like Wolf 3D was quite boring and could really use something new to jazz it up, and I didn't see that in this.
I could go on, but I'm very glad to see that you say that the game is super unfinished at the moment: gives me hope that my feedback can help make this into an incredible finished product! I'm only being harsh on it because I love shooters and there is definitely a lot of potential here for a great game, so hopefully no harm no foul!