The design of the monsters is very successful and the idea of defending the lab is a good idea. Afterwards I don't know if it's me who didn't understand anything but I put traps and I pressed the green button but the monsters cross the level as if nothing had happened and they go to the other portal where they stay in the air... and I also have a tremor when my character moves in the level... a suggestion like that would be to start with a smaller level in size and one or two things to defend yourself in order to understand the mechanics.