It opens with ease. Only a child could struggle with this.
The kernelsprite is one of the mechanics most broken by the thing that you've been tasked to fix. You've been told a couple times now that this should accept player input, quite a range of such input too. Anything that has personality, from a licensed character to a photo of a departed loved one.
Some of the descriptions even suggest they could raise the dead. They're kind of scary.