This is AWESOME! I spent a lot of time playing this, and I love it!
The graphics could use some help, and suuuure the time mechanic was not really introduced in the game, but the gameplay more than makes up for that!
Its like the Heist meets the shooting from Red Dead redemption, meets top down tilebased strategy.
I loved the shooting though player bullets could be slightly faster, and maybe you should consider adding a way to regain health, though I like the roguelike high difficulty level. It is intense, fast, and really draws in the player.
The time stop mechanic was a moment of surprise to me, where it just clicked, and I went nuts let me tell you! Pulling off all sort of maneuvers. The pick up on key 'f' was a bit out of place, and I also didn't quite get that I could open the doors at first with 'E', all of this could be helped by a tiny text box above the interactable objects instructing the player to press that key.
Good work! Really good work, I would love to see this game in a finished state, with some graphics improvement, and a bit more polish I think you could have a hit. Fun, fast and a delightfully smooth performance.