I'm sure you already know most of my feedback already, but I'll go ahead and give it anyway.
The core gameplay loop is there, each level is also fully randomized, and from a couple runs I tested, so are your characters to a degree, or at least one of them is. The game being unfinished makes it difficult to tell who the characters are or what the rules are, but it seems you get a game over if the knight dies. While health remains consistent between levels, I noticed your allies respawn after a level is complete, meaning you seem to be incentivized to keep the knight away and fight using your allies.
The sound is there, but no music, even a simple loop would have been nice. A lack of displayed information makes it difficult to tell what sort of stats or attacks the units have. Overall you simply needed more time to refine the idea, but I saw your comment below about not having the time. My advice for future attempts where your time is limited is to try focusing on providing information to the player that can help them make choices, and then worry about polish second. Even a label or two in random places can help compared to a lack of information. Best of luck on your future projects.