This game manages to have a tutorial, dialogue system, multiple levels and creative mechanics. Wow! How you managed to do all that in the time frame seriously impresses me.
However, there are a couple of things that I would adjust if I were to update this game, namely:
The character moves quite slowly, which made the long walking sections between each puzzle section a bit tedious, I would make them faster or reduce the distances between puzzle sections.
The stealth cooldown is too long and the ability can be used an infinite amount of times, which results in the easiest way to beat most sections being to wait the 30 second cooldown repeatedly, so perhaps a system where the ability doesn't recharge automatically but there are "stealth pickups" that allow you to use the ability again would be good, and encourage the player to beat some sections by actually avoiding the enemies cone of sight.
The hitboxes for some of the enemy cones were quite inconsistent, and for the moving enemies it snapped 90 degrees when they turned too rapidly to react to. I don't really know if there is any easy solution for this that you could have implemented within the time frame of the jam.
With all that being said though, this is impressive work! You should feel proud of yourself.