We got it from gamefly last friday and so far I really like it. I only have a few nitpicks about the controls... when you push up against something, your character will immediately slip forward (forwarding being out of the TV, towards you) around it... I'd rather he just stood there pushing against it to preserve my sanity but I think I this might be a side effect of how it tries to put you on the correct plane when you're jumping between planes.. In any event, it took some getting used to. Also, everything feels a bit too slippery, sliding to your doom isn't very fun. That said, it's a pretty solid platformer. If you like super mario bros, I can't see why you wouldn't like this and like baked said, if you don't like SMB, you really should just go DIAF.
Also, my gf wont shut up about how cute it is. So far we've spent a good portion of time either dressing up our characters, or 100%'ing levels so we have more stuff to dress up our characters
I hear you can build stuff too.. I want to get into it, but I read somewhere it's better to play through the whole game first so you have shit to build with. My lady being the OCD completionist she is (she's the one pushing the 100% issue, I'd just do speed runs through all the levels if it were up to me) it might be a while before we get there.
Definitely going to be a keeper.
edit: It's slightly less stressful than Street Fighter.. like any good platformer there are some tricky jumps to make that will test your patience and commitment. It gets very tempting at times to just say "fuck this shit" and throw the controller through TV..