I saw the stream of 3 days ago , rly awesome ... until i saw this xD .. tall muchrooms that use the smash attack in a way that not even a drunk person is able to do... just kidding ..
Me and other people, and many others i think, agree with the fact that the mushroom animation is pretty bad. It doesn't feel natural and fluid.. and it doesn't make any sense. It's extremely uncreative. I hope it's just an animation made for some test ..
A mushroom like this should attack using spores, gas, poison ... roots. Not head smash ... it's ridicolous. How a fungus can deal damage to an armored hero with just some fluffy attacks.. Hope you change that...

Also he can cast some sleep magic ... if you want him to be able to attack like an human just give it hands, eyes .. legs and some thorn or horns . To make it more realistic, logic and immersive.
The legs are too small and his balance when attack it's a miracle.
At the end it's not bad , but not good neighter. For being a smash attack made by a fungus is rly rly good, but the idea doesn't work for me.
It need to be more fungus like.
thz ...
if it is just for demonstration it's a waste of time... make it appear as intended for the release.