Thanks for playing! Yes, in order to trap enemies, PNJ needs to collide with them. I should have also indicated that PNJ lose 5 kg mass per trapped enemies, and when it PNJ's mass reach 0 kg it restarts the level.
"The engineers remind me of the ones in the _Chernobyl_ series!"
-Yes! That's the inspiration I got it from, there's also inspirations from other TV series as well.