eternal Halloween

Your town has been living an "eternal Halloween" for a long time now. Every night, after sunset, you must go out and kill small monsters to prevent them from growing and attacking you. You kill them with a special weapon doused with holy water. You also need to be careful, as there are more powerful monsters hiding among people in Halloween costumes. If you don't pay attention, you'll be killed, but staying home won't cut it! You must take to the streets in costumes, otherwise, the outcome is inevitable. And how did it all start? 19 years ago, a group of children decided to perform a ritual to ensure Halloween would never end. They naively thought it would be an eternal holiday, but it turned into a daily nightmare.