I really like the set-up of the game and enjoyed the appearing walls and variety of obstacles placed throughout the levels. I found the player movement to be frustrating as it seemed slow. Some of the invisible walls didn't appear before I ran into them which could create frustration if you're outrunning an enemy and get stuck on what looks like nothing. I think that adding the alarm enemies in the third level after introducing the other mechanics slowly was a smart way to do it though, and I do love that they are alarms since that fits the theme so well. I think overall you did a great job and the game could just use a bit of small tweaking to feel better to the player. I think you did an excellent job at player feedback and telling the player what to do and what just happened / what killed them.