Thanks for the feedback, much appreciated! What do you mean by softlock? Did you also have trouble finding the key?
I didn't have trouble finding the key. Unless I'm mistaken, the key is given to the player after killing what I think is the boss. I was killing all enemies anyway, so no trouble there.
The blue key room (I have a video. DM me on discord if you want to see it) is 4 rooms connected by the corners. There's enemies, but no exit portal there. You can walk into the void to reset, so I guess it's not a true softlock, but seems unintended.
Ok I see now. On that level there is a room across from one of the doors with an enemy with a teleport reflect, the idea was that you would see it, come in to range for it to attack and you could teleport across the gap , killing the enemy, picking up the green key and the portal back is right there. Thanks again for your feedback btw, definitely some blind spots with my attempt at level design.