So many helpful ideas XD
We just tuned some parameters in version 0.3.4/5, such as birds are much more easier to be killed, sharks are less threaten(too gentle though).
And it had been equiped into this version that survivors can reproduce, but it seems too restricted now.
More types of storage boxes/rafts/beds will be added in the comming updates.
Battle/Fight/Attack system will be redesigned in the next version(0.4.x).
Thanks for your feedbacks. :D