I love this.
The gameplay idea is really neat and the mouse controls are great.
The slow-mo feels cheesy. It's really easy to just cheese the game by going slow-mo all the time. There should be some mechanic to limit the amount of slow-mo you can use. The difference between normal speed and slow-mo is also pretty stark, maybe speed it up a bit.
I really like the health system visually but I don't much see the gameplay purpose of the lowered vision. The simple graphics look nice and pleasing. I could see this work exceptionally well as a mobile game.