I disagree about wind up key. Even before its recent buff, it could be used to save a line of babies that you knew would get eaten anyway. The only other thing I could think of for it is if it could launch salvation manually, that would be nice.
Loosing charger is one of the biggest losses, as one costs a lot and you get less coins after each level. Plus if line would be eaten anyway, charger would launch anyway, so wind-up key with current ability is much less preferable compared to many really useful items .
