Really? New tiles or parquet is cheaper there?
It always depends on whether with or without own labor. Parquet or tiles with installation will not be cheaper.
But the material can't be that expensive?! It's just a kind of mass...
Such microcement for DIY is probably around +/- 40-50€/sqm on the internet. You may first have to do some filling (depends on the condition of the floor) or use more material. Then maybe a primer/undercoat, then 2 times applying and smoothing the microcement. Then 2 times final treatment.
That is the basic standard. It takes quite some time (days, since everything always has to dry).