Help! Can't enter the last level *Spoilers inside*

[SliceAndDice]

Thanks for helping me, jens!
I actually tried what you said (Steam couldn't find anything wrong with the game ) and started from an older save file/another level but I still can't go on after the fight with Tesla... It's like that next level just doesn't exist.

It is very odd indeed and I couldn't find anything similar while searching the Internet. I'm completely at a loss here.
Do you think reinstalling would help the matter?

~Greetings from Germany~