Striking visuals. High contract makes it very easy to spot the different types of pins, in such a tight crowd it's a really good call on your part.
The idea is interesting but held back by technical shortcomings. The ballroom is gigantic and densely packed with guests, sometime overlapping with each other and hiding their pin. This combined with the hitboxes problem makes it a bit tedious to find the intruder when she spawn close to other guest.
Solid entry overall. Nice music choice.