As 6matko said, the game is a little slow and their is some hitbox problem but the game is really cool. You could improve by :
- Add a bit more pixel to attack to prevent the need to be "too much" close to ennemy
- Maybe modify a lil bit the velocity so the player can move faster or maybe create a "sprint" key
- Check the snake hitbox (I think the hitbox of one side is larger than another)
Great work ;)