Nothing wrong with a bit of whimsy, but I fear that it could be the death of Steampunk.
Why? I hear you cry. Alright, I don't, but you know what I mean. The why is pretty simple - if the superficial trappings of Steampunk are all that are perceived of the work, and the characters are cardboard Victorians with stiff upper lips and clockwork blunderbusses who say 'Bai Jove!' a lot, then you are doing yourself, the reader and the genre a deep disservice.
It can be done well. Read G. K. Chesterton's 'The Man who was Thursday', or George and Wheedon Grosmiths'The Diary of a Nobody', or Jerome K. Jerome's 'Three Men in a boat' as great examples. Mind you they are all real Victorians, which helps. Philip Reeve does it very well in 'Larklight', too, btw. But all of these works balance whimsy with a deeper subtext (even 'Larklight').
All I'm saying, really, is maybe write something that does you and the genre justice, that gives it depth, that shows that its more than just dressing up and funny accents and crazy gadgets.
Now don't get me wrong, I love a crazy gadget and a good pun as much as the next man, but sometimes you need a bit more than that. And I think Steampunk does, too.