The knock-out time seems a bit inconsistent. Sometimes a cookie that's knocked out would wake up almost immediately despite me having knock-out timer at level 6. The collision box on the puppy sometimes stops me from reaching the cookie on top of it, too, and by my experience of the game I suspect even if a cookie is knocked out, it still halves the TPS if its collision box is still on the puppy (if they're actually knocked out when I think they are). It'd be helpful to show a timer above their head or something for how long they're going to stay stunned or more visual cues for if they're stunned in the first place.
Because the penalty of having cookies walking around is very high, it's hard to see progress unless the knock out timer is buffed. It'd also be helpful to have an upgrade that improves "tamale per click" so the player would have more control over the situation when the knock-out is too short. Or maybe a power-up to make the puppy less helpless and fend-off the cookies once in a while.
Some visual changes when items are leveled up would be nice to have, too.