Act 1, Chapter 7. First of all, play this on the easiest difficulty.
This solution is intended for people who have at least one co-op partner as it makes things a lot easier than using a second controller. The boss fight has three stages where it increases in difficulty and speed with each stage.
The first stage is pretty easy. Pull and punch the first eyeball with
followed by tapping
, then dodge the fists as they come down. Be on the lookout for the shadowy circles on the ground to dodge either left or right with
. A good tip would be for one person to stand all the way to the right hand side, only needing to dodge left on occasion. This pattern varies but my co-op partner had more luck dodging in one direction rather than both of us standing in the middle.
Now here's where it makes things manageable: when the green eyeballs enter the screen during the second phase, you will also fight 4 pink eyeballs. They spawn in groups of two on each side. Simply place yourselves in opposite directions and use
to gently punch them about 6-7 times until they are stunned. Try your best to keep them to each side of the screen. Don't overdo it as it's very easy to kill them. Once all 4 pink eyeballs are stunned leave them alone and grab the green eyeballs one at a time and have both players punch them simultaneously from each side. It helps keep it in one place since you also have to be careful here as to not destroy the stunned pink eyeballs. They'll keep respawning if you do and will make your situation worse.
For the third stage you repeat the same as the step above. Just be aware that dodging the fists are a bit harder and you'll have 3 green eyeballs to deal with. We found that the pink eyeballs seemed to be the biggest annoyance so keeping them stunned at all times definitely helped!
Hopefully some of you will find this helpful, and good luck to you all