Pitch here is fine, it matches the character well enough and provides a clear amount of support for your line delivery. The delivery itself is well paced, you're very quick here but the squeakier, joking tone you've got going actually compliments it well. The mischievous and murderous tone is a nice election for the type of crazy you're representing here, though I will say that you probably need a bit more volume to your laugh. Don't be afraid to draw out some of your lines as well, the fast past is good but there are parts like the laugh and the second lines where you could benefit from this.
I agree with you wholeheartedly, drawing out some of the laughs could have brought a bit more to the characterization I was going for. I'm noticing that the laughs made the lines fall a bit flatter now that you pointed it out, so that's something for me to watch for in the future. Thanks for the constructive criticism! Every bit helps!