To be fair, being unable to move/attack if you miss a beat will get you killed in many situations. Keeping the coin multiplier is important if you want to be able to make use of the shops. Additionally, there is a character that instantly dies if they miss a beat (well, more than one character actually).
Yeah, I didn't want to bring up the whole thing about that one character (didn't know there was more than one, actually. Haven't unlocked everybody yet).
The thing about the coins is that in a single-zone run, the shops are so cheap that you can afford pretty much everything by the first floor alone if you do well. I often end a single-zone run with hundreds of coins left over unless I go absolutely crazy in the shops. In an all-zones run, the shops are so expensive that you can't buy much that early anyway. I think what bugs me is that even when you're maxed out, you can only get the multiplier up to four, I believe. Even if I whiff a beat, it still gets back up to four really fast, so there's not really that much punishment for missing beats.
I would say the idea of the game is easy, but in practice it's a lot harder than it looks. I have most of the characters done in All Zones runs and I'd say it was pretty damn hard.
Yeah, but what part of it did you consider hard? Was it just keeping on the beat, or was it dealing with all the enemies and their patterns? I hardly ever miss any beats, but I regularly take damage when dealing with a room full of monsters.