On 3DS, the 3D isn't overstated, and provides a pretty nice effect. It's certainly not required, nor does it feel like the primary platform, but in a few levels in particular it makes the obstacles a bit more pronounced. It looks relatively the same as the other versions, and plays great either with the circle pad or the d-pad. It also has a StreetPass arena mode for asynchronous multiplayer, which is great if you have a local friend who you can enjoy the game with.
Both the Wii U and the 3DS version have support for quick item switching, by way of tapping the GamePad and the lower screen respectively. Think Mega Man X -- where you can instantly switch items by tapping the icon (projectiles and defensive abilities) on the fly. You can still pause the game in any version and select them from a menu, but the tap method feels a lot more natural. The Wii U specifically supports Remote Play and a small amount of Miiverse posting. You can also use a Pro Controller, Wiimote, or Classic Controller instead of the GamePad.
I really have no complaints about the PC version, although you're missing out on all of the other features above. The real benefit is convenience, as you can load it up on any machine that has access to Steam, as well as use any controller you want. To switch items you'll have to pause the game and select them, but it's not a major hassle. In general the PC edition is really responsive and runs great.
So really for me it's whether or not Battle Mode is cool because that Street Pass Multiplayer feature sounds like something I'd use when hanging with GameDadGrant or any of you other people in the future...
Yeah, it is definitely a game that you can make harder with your playing decisions. Hell, the health upgrades are completely optional. I could see myself playing through while trying to limit how many I collect.
Shovel Knight rocks. Hope they are serious about making an objective based platformer Shovel Knight 64. To Kickstarter!
Yeah, I really do adore this game... have put over 6 hours into it in the last 24, which is quite rare these days. It looked very special from the first day I saw the Kickstarter and it's so nice to see that it has lived up to its potential in every way. I hope it gets the sales that it deserves... Yacht Club Games may have a very bright future ahead.