I thought your game way pretty cool, I liked the aesthetic of running and gunning across the roof tops. I did the "less health = move faster" idea with my game some too.
If you wanted to improve, shrinking the GUI elements to open up the gameplay area would be nice, all of the information on it is nice, I really liked the mini-map effect, it just would block the enemies sometimes. I also suggest giving the player a higher starting speed and maybe less health to improve the flow of things.
Overall fun game!
Here's a link to my game: https://iangogo.itch.io/out-of-time