It's an okay game, but there are a couple issues with this:

Every time you get a game over (Or win, if you get lucky), you'll have to refresh the game to play again. But especially in this game where you'll die so much often, this gets really tedious.

Clicking with a mouse HURTS my finger, there's no holding down the button to shoot.

Some of the boss' patterns are either impossible (Ex: Getting cornered by a flurry of bombs, or when the boss chases you so fast that you can't outrun them), or the boss are unpredictable to the point that you'll eventually get some cheap shots. One time they were stationary to shoot bombs, and the other is where they suddenly chase you the moment you get too close to them. The teleportation is pretty cheap, but it's the only pattern that's pretty easy to dodge.

As mentioned in the previous point from above, this is to the point of getting really lucky with boss RNG, and not by skill at any chance. The bomb's radius is large enough to stop the player from moving away, let alone the arena being too small to do anything. It really defeats the purpose that you can't just simply shoot the bombs to diffuse it, like what the original Minesweeper would do.

Overall: It's good for a simple game, but accessibility concerns and balancing issues with the boss' attacks, it's not something I'd play often.