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Interesting concept!
It needs more tweaks but making the player make multiple decisions at the same time is a good idea I think.
The version now we are playing basically force the player keep slashing in the end. Maybe 4 players at the same time were too much. Or maybe it only needs more tweaks.
Besides, like the art of it.
Nice work!

This is my game, please give it a try if you will:
https://itch.io/jam/gmtk-2019/rate/461812

Actually, I know it's not very clear but if you wait 2 seconds after a hit your next hit will do 1.5 times damage so if you line up all 4  to have the enemies chasing you then you can kill all of them in a single hit with that strategy. From my testing it's way more efficient to do it this way but it's not intuitive nor the easiest way and as such yes, you're right more tweaking is needed.

I think most importantly I should have made it more clear that's how you do a critical hit. Right now I just have a visual indicator of when it happens by having some particles swing out of the sword to make it look like you're swinging it through the air much faster. It also says it in the description on the games page but I doubt most people read that. Other than that the only way to tell is by looking at how much the enemy hp goes down.

Maybe this just isn't enough of an incentive to not just spam your sword. I want spamming to be able to still happen because when I made it so you were forced to take time between your hits it felt sluggish. Maybe I could do some sort of ramping damage so first time you wait 2 seconds it's 1.5x damage then next consecutive one it's 2x damage and keeps scaling till you do an attack too fast. There's a lot of different ways I could attack this issue. Thanks for bringing it up!

(+1)

Yeah, I think what you are thinking is right.
I read the description before I played, And used the wait-and-slash strategy at the first. But there is just too many enemies to me in the end. And I can't dodge all of  them in 4 screens at the same time and do that strategy. 
I'd love to see how you will tweak it into a better game^_^