Co-Op Endless - save progress

Thanks for making the Replanted edition!  One part of the original game (XBox anyway) that we always wished was different was the ability to save your progress on the Co-Op Endless mode.  

I have just started Adventure mode so have not unlocked Endless yet, but I hope you have corrected this and provide the ability to save your progress!  If not, perhaps you will consider adding it in. 

Thank you!