The Black Bean = too pricey for such situational effect, especially as it's only for close placement and effects only once per baby. Either needs lower(33) price or other mechanic of use, say farting attack for defensive babies(then 99 price justified)
Wind-Up Key = who would want to use that, when chargers are super valuable?! I propose change: one use per level, manual launch of 1 charger, and next level charger would be back on its place.