Thanks! I almost didn't include that level, but I'm glad I did.
Lasers and switches were one of the earliest things I added, and had other mechanics related to them that I ended up cutting for being redundant, conversely, keycards were one of the last mechanics I added, and some puzzles just wouldn't work without them.
Also, I thought the sudden escalation from locks and keys to hi-tech laser grids would be funny :y