I had fun playing this

Proof you don't need tons of different items to get something nice.
Great! That was the first idea, have quick and simple gameplay.
A bit of variety among foes wouldn't hurt tho.
There is a little of variety later, with monsters moving in the 8 directions, or summoning other monsters, but I get your point.
The fact you use 2 chars for every mobile/items is a nice idea ... Never saw that in a roguelike before but it's not like I played a ton of those (about 10?).
Initially, the game was using Curses, were chars heigh is about twice their width, so I wanted to have cells squared, by using two of them. Then I thought that I could use this second char to display extra data, like the weapon held by the player, the quality of an item, the level of a monster, etc.
With Libtcod, I wanted to keep this system, so I scaled the terminal font to get 8 x 16 chars.
I'll definitly try to beat it

Good work!
Thank you, and good luck!