My sister uses this style too.
I'll have to agree with not_Scyess on the language, although I admit to being biased against what I call "pre-teen speak" (for reasons developed during my past, if anyone wants to hear about it).
HOWEVER, your comics range between "cute" and "nice" (i.e. potential), funniness-wise.
I strongly urge you to type normally with your future comics, and use this typing style only where it would be more logical (say, when someone's reading it off a computer).