And under 10 minutes? You sure know your SMB tiles!
Oh, whoops! It's a mockup. I mean I'm sure it wouldn't be a problem to put it in an actual SMB ROM, but I didn't even put it into the real game. Aheh... sorry.
Not bad at all, but I would use the term Sis. (in comparison with Bros.)
See, I thought about that, but to make it totally one-for-one with the title Super Mario Bros., you'd need to make it Super Peach Sises, which looks awkward. I mean, simply Super Peach Sis. could work, but then you lose the plural that the original title was going for. Super Peach Siss. is out of the question from the start.
Then there's the fact that Peach and Daisy aren't related like Mario and Luigi are--they're cousins, not sisters, right? At least, that's what I was told. So SMB became SPG.