After doing the virus evolution i for some reason get a new growth phase with all my tiles having unlimited use. Repeatable use is fixed by going down a floor, but after doing another evolution it all begins anew. Since i guess there is an evolution tile on each floor, i think i can do that infinitely. I did go 5 floors deep for testing sake.
Video evidence in case it sounds too much:
https://youtu.be/rWe_Lxl9_rw
After clearing a floor without collecting the virus evolution, i got back to growth phase, but without any tetris to place (last screenshot)