I doubt it, there is another scroll after evil laboratory.
I'll let you know whenever I finish it.. probably a few days cus this is literally starting to take forever to finish one with how badly the stamina thing is managed atm.
Please do, I'm way behind you in the lab.
I am hoping it would be like the last world, where we got her in "save the princess" and not the last scroll.
From my understanding w4 is not finished/in the game.