The Portal (Art of Level Design)

Game summary You are a space marine, you have infiltrated a military base on Mars, which was built around an interdimensional portal from which dangerous creatures emerge. You have to locate the portal and find out what kind of experiments are being carried out. Technical info This is a playable prototype of a fps level that I designed. Currently I focused on level design (game space, metrics, combat encounters, pacing, events), trying to create an engaging level! I would appreciate your feedback on it. I will upload on my youtube channel a video about how I designed this level. Thanks everyon...