I like the visual effects when you hit the tree, that's genius! But I notice that the player has no invincibility frames after getting hit by the monster, I'm not sure if this is intended or not but yeah it can be annoying at some times. I know this can be countered because we can spam the attack button.
If I were to further improve your game, I'll surely make different attack types, like heavy / light attack, adding invincibility frames when the player got hit, and make more monster variations!
Overall the game is very enjoyable. Cool entry! And again, I like the effects on the tree!