Hey FTWRahul!
You did a really good job at introducing mechanics, I felt! I really enjoyed your game, great little puzzle stealth experience.
I liked the puzzles for the most part!
You've got a problematic difficulty spike here:
I think the issue is not so much that the solution itself is particularly hard, but that the player starts in danger.
About 3 seconds into the level, the enemy will kill the player if they haven't moved. I think this distracts the player from actually solving the puzzle, as they need to deal with that immediate problem before they can think. Which would be less of an issue if this wasn't also a level where you're teaching the importance of positioning enemies on switches.
Perhaps a redesign where the player can observe the enemy before placing THEMSELVES at risk would work better?
Also, while you can hide from the bad guy by standing to the side of the room, that's not exactly intuitive. If that's going to be a part of your system, I think you need a whole level to teach it (hugging the wall is the only thing you have to/can do to pass an enemy).
You could also expand the wall out to give the player something obvious to hide behind to indicate that they SHOULD hide?
Quite a few different ways to solve this one, you'd have test them out and see which is your favourite :)