I'm glad you liked what you were able to play. I'm very sorry that you experienced the crash, I'm not sure how many people have experienced it but I'll be fixing that immediately after the jam ends.
If you still want to try the sewer level just for fun you can press "CTRL + ALT + P" on the scene select screen. I don't believe there are any crashes in the sewers as breaking the tables in scene 2 is what causes the crash.