The regroup as feed feature is amazing. The checkbox thing I believe can be more easily integrated as another option in the poll, making it maybe more easy to add multiple options (can be a specific checklist "poll" box that is collaborative and can be edited by the other user).
The camera shaping feature can be maybe changed to an emoji-based video allowing a specific emoji to be instantly reacted or shown with the camera post once sent, or it could maybe be a "hands-free" shape in which you yourself draw the shape of the camera in which the recorded video will appear in.

Check list as a text format – cool cool!