itch.io

Yeah, you could do 1 door to solve the problem but I think the gameplay would become a bit too predictable. It's fine to have enemies come from any door I think, just as long as its telegraphed. Doesn't even need to be an arcade style "!" which can admittedly be too obvious sometimes. Like the door opening with a bit of light shining in before they come out is enough to telegraph the oncoming enemies with a bit of nuance. making sure the player doesnt find themselves having an enemy spawn on top of them during battle is a problem to solve for sure in any case.

Another potential solution would be to put "yellow paint stripes" surrounding the area at the doors where the player is at risk of not having time to react when the troopers storm in. Like a hazard zone baked into the background layer. Then the player knows they are at risk by standing there.