Can't remember name of old 90's adventure/puzzle computer game?

It was a sidescrolling game in which you had to solve puzzles in various rooms. Some of the "enemies" were spiders and bats and maybe snakes, and you were able to shoot yellow lasers and could obtain a forcefield that would last a certain time. One of the puzzles was that you had to turn mirrors in a certain direction so when you shot your laser it would bounce off in a certain way. I'm not sure but I think the intro sequence had the guy walking into a pyramid but not entirely sure about that one. There were Greek letters but i'm not sure how they were involved (maybe collected them? i don't know). There was also a puzzle that was some sort of grid with symbols and you had to find pattern or something again it's all really unclear. If you can help me remember the name, that'd be great!