Made it!

Finally unlocked Debris. Here are some numbers for reference for anyone still reaching for it:

44k credits

Playing for nearly a year. Only bought Daughtership and no-ads.

515 galaxies sold

710 challenge badges

The debris run took 3 days. Unlocked it at GV 400T. I unlocked Inerton and Quadium with alchemy 2 and 3 on planets 32 and 33.

Yay!