I had a fun time with this game! I especially like the design and animation of your main character. The movement and gameplay are nice and simple, and I especially liked the roll ability - the animation was nice and smooth, and it was really satisfying to roll into side corridors and away from enemies.
There are a few things I might have changed though. The enemy behavior was pretty unclear which led to some frustrating moments - it was hard to tell what triggered them to pursue you, and also under what circumstances they were able to catch you. There was also a delay before the alarm went on but after the enemy had seen you, which sometimes caused me to get caught before I even realized I was seen. Adding visual indications for the guard's 'alert' area and capture range would probably help a lot.
I also think the game would benefit from focusing purely on the stealth element, since I think the cool movement and sneaky feel are the most fun part as is. The combat felt a little loose and dull, since you could generally just kite enemies around and spam the mouse. Unfortunately, this also tended to be the easiest way to clear rooms.
Fun game overall though! Great work!