What to do with the floor?

What, O WHAT will I do with this floor?   some of this stuff stuck on the wood is rubber cement glue, and the rest is some other hard stuff?   HELP!

I decided to just paint over the stuff really thickly, and in boring blue,  to make it sort of like a concrete lookalike which you could see in a regular shopping centre.

I have yet to paint up the walls.   I plan to paint them like the trim on the outside.  Full on gloss white.