The key is just to survive the waves and time the last little bit so you have an Invulnerability Potion up right when you hit the Dev. And at that point you mash buttons. Actually what I did was two swipes of the keys. The first swipe started with one finger on ";" and the other on "." and swiping left, then immediately jumping to "=" and "]" and swiping left again. Once I could get to the developer without dying, I was 100% successful with this strategy.

Oh and don't worry about the layout, don't even try to watch it. Just watch the \o/ vs. Enemy area under that.