Short and sweet! I liked the overall mechanic of placing the fans ahead of time and then seeing how your strategy pans out, however some little quality of life features would have been nice. What I liked is that you already implemented camera controls, however it would have been nice to have your fans maintain their position in between tries. That way you could just make tweaks to your strategy and see how that changes things instead of trying to match the settings youve had before.
I also found the fan spawning a bit irritating, as it never spawned in the place I wanted it to and then grabbing it was sometimes a bit finicky. Maybe instead of the plus sign you could have had a fan icon that you drag into the level to determine where it was supposed to spawn, I think that would have felt better.
These are minor critiques though and mostly personal preference, overall you did a great job! Well done :)