Congrats on the game, it’s a fun one!
As for concrete feedback, on the controls section you should mention ‘wasd’ to move the character, as it’s easy for people to assume you’re just killing the monsters. A background, even a simple one with just lines, would help the perception of movement. Likewise, having the ‘score’ reduce when the player moves backwards would be a nice bit of gameplay feedback.
Other than that, there seem to be some bug where the creatures don’t get revealed occasionally and die immediately. On the other hand, and I’m not sure if this is intended, some creatures of the same type seem to require considerably more hits than others to die.
But overall, it’s a fun idea, congrats.