Okay, first I did a playthrough and won in about 5 minutes. This is because I do not find it difficult to hold down left click for 5 minutes.
Then I actually played the game. Early game is hard, but it only gets exponentially easier as you quickly start stockpiling clones. I found that the radius had no limit, which in combination with high stun duration and a bunch of clones, leads to complete invincibility as any time an enemy is hit, the entire map is stunned for a very long time and all the other clones start clicking and reapplying the mapwide stun. Since enemies keep spawning, there will never be a point where there are no enemies to click and continuously proc the stun. Judging by the screenshots, you seem to be aware of this.
The circle for clicking is a PNG, which leads to it getting blurrier as it grows. I’d switch it for an SVG which doesn’t have that problem.
There’s nothing much to say about the visuals, though the damage overlay on the button flips itself when pressed.
It was a fun game, I gave a 5 on enjoyment.