I think the game has solid fundamentals, running around and killing slimes is pretty fun. What this game really needs though is something else to it other than just killing slimes; there's nothing really unique to the gameplay, and there's only so many floors of slimes you can kill before it gets old. It would've been nice to see some other gameplay mechanic mixed in, like maybe your light is going out and monsters get stronger in the dark or something.
Also, while I think the retro-tv aesthetic is interesting, it does kinda hurt my eyes looking at it after a couple minutes; I would've preferred if it was only in the menus or gone altogether, considering it doesn't really connect to the gameplay.