(edit): I was was wrong. Didn't pay enough attention in my first play-through. Pretty good game. Thanks for making it!
I like the game, but I feel like the game's design isn't really focused on it's core mechanic.
The core mechanic being setting up traps and activating them. That's the main unique mechanic, it's in every level, and that's what the boss fight is testing you on. However, your score in the levels is judged by how many treasure chests you find, a task that can be completed without killing anything. Also, until the final boss, you only ever have to kill the game's first enemy with traps. In every other scenario, you can just sprint to the chests, then run to the exit avoiding everyone. The safest, fastest, and generally most effective approach is one that completely avoids using the game's main system.
Sneaking past everyone is the main goal in Metal Gear, and the game is built around it. In your game, it's the main goal, but the core mechanic is centered around dispatching enemies.
I like your game; it was fun and very well put together. It's just that your inspiration (MGS) and your unique ideas (Laser traps) didn't really line up with each other.