I did review the controls page first, and knew what the objective was, but I didn't see any guards. Also what I played wasn't a challenge, just didn't really see what I did to progress the next level, it was more of when I interacted with something in the game, it wasn't obvious what that interaction did. Like clicking on the electrical box, it created sparks, but that's all I could really tell what was happening. Maybe it's because it was too dark for me to see other gameobjects in the world. I know when I played through I didn't see anything that looked like an enemy either. So maybe that was the issue.
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huh, I'll have to try the game out on a few more machines, the golems/guards are the only other entities in the game so they may not have been showing up or something.
As for darkness, I have noticed that the game seems darker on some systems/monitors, but I tried to make sure that anything that was important was illuminated or had emissive textures. The only actionable changes I think I'll be making are to the initial level design and maybe the terminology specify that the bird creatures are the the things you're supposed to kill.