The idea is interesting, and I like how the UI shows in which state you are. However, I would like it to be more clear when the state switches. Maybe there can be some UI that is shown just below the player character, to make it easy to see in which state you are. I also wish the gun would just auto reload. It's a pain having to do it manually.
In the screenshots I see that there is an ammo counter, but I didn't notice it whilest playing the game. My advice would definitely be not to have almost all of the UI crammed into one corner of the screen. Have the health on the left, ammo on the right, score top middle (already the case), and the current state UI top bottom.
On my first try the movement was bugged (couldn't move even when in the move state). This was luckily fixed by reloading the page. I think it was because my mouse was configured for left handed use, since I switched it back to right handed before trying again.