Art and sound were awesome! Took me a few tries, but I eventually managed to beat him with just a few seconds left on the clock. I see someone talking about a more intuitive way to defend, and I'd agree with that. The defend menu was so unintuitive to navigate for me that I eventually felt like I was losing more time and damage trying to defend. In the end, I won by spamming his weakness, face tanking the damage, and repairing when necessary. I never used the booster or the breaker for a similar reason.
Admittedly my strategy was probably not the best (I assume it's faster if you do use the other skills, as I almost ran out of time), but it was more realistic for me to be able to pull off.