Substracting Score Mole Mash

I did the Mole Mash V2 with Sprite Layering and it came out perfectly, however, I wanted to do substract some points as an extra feature if one misses the mole but I can't figure out how to program that. Here is what I tried to do but it didn't work.

Thank you for your help!

Your blocks look reasonable.

What didn't work?

Did you not want your score to go below 0?