<human>: Provide a brief overview of the text.

Last month my SO and I rescued a starving, pregnant, stray cat. She is absolutely wonderful. She loves being an indoor cat, never tries to get back outside, constantly wants to snuggle, etc. She is also incredibly playful. She does the normal kitten things where she'll wrap herself around her legs when you're walking downstairs, or attack your toes when you're sitting on the sofa, etc. 

Here's the "problem". Sometimes we'll be playing with one of her toys (we have a couple of those wands with the feathers and strings at the end, etc.) and she's going insane and it's obviously play, but then I'll go to imitate the play she'd get with other cats (I know it's not recommended, but I love hands-on play) and she doesn't use her claws, which makes me believe it's playing, but her ears will go back, and she'll jump and pounce at my arm. Also, sometimse if I don't start playing with her when she wants me to (if I'm getting ready for work, etc.) she'll sprint into the bathroom doorway and "spit" at me, then sprint off. I've never heard a cat or seen a cat do this before, and it worries me into thinking that she's being aggressive. Do I have anything to worry about, or is this play?
<bot>: Sometimes my wild-turned-indoor kitten will spit at me when she wants to play, and will put her ears back when playing. Is this aggression, or just play-time?