well, go back to spider boss area, move left on top, there is a white spider enemy, finish it then go left, you'll see a place can enter, enter then climb up, you'll see there is a door, enter it, then you'll reach new area, moving left, you can find short cut, moving right, you can find research lab.
btw, there is no save point in research lab yet.
Hmm this is strange. So for the first time ever I tried to play the game with a controller. Got absolutely trashed by the spider boss. Huh. Switched back to KB+M and trashed the spider boss easily. Weird.