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.

I got to 59 meters! I could probably have gone further, but those enemies sure like to latch on! Are they faster or the same speed as the player? Because I noticed that once they touch you, they will never leave your immediate side. Making them just a little bit slower, or maybe adding a damage knockback would help with that. 

It took me a little while to realize you were supposed to walk to the right, there's no visual indication in the background that you're actually moving. Just a quick tiled texture and maybe some milestone markers every now and then would help the player know that they're doing the right thing.

Nice job! I hope you keep jamming!