On my first couple of playthroughs I kept missing and misreading things. I missed that the arcade was in the Ice-cream shop, that certain weapons could only be attached to certain characters, and I think I only pressed the special buttons for the two characters that couldn't use them, so I never healed or used the Nanotechs uber powerful lightning attack.
Anyway. I gave it a second playthrough, I figured the combat out, and blitzed through the first two floors. All in all it was pretty fun! Lots of environmental variance, and I like the retro 80s theming.
This is the first couple of goes at x4. I'll post the unabridged final playthrough tomorrow.