Offstream feedback 1.
The game looks great obviously, except you could still juice it up a bunch. For a game with clicking, you could add a custom cursor with a trail effect, which basically always looks great. You should also add a white flash for when you click on the circles for a bit more feedback as the "ding" SFX really blends in with the violins of the background music.
The gameplay loop is obviously repetetive, which you could sort of fix by adding new types of orbs to click; maybe some of them need you to click multiple times, or for some, you need to spin your cursor around it (kinda like in OSU).
edit:
The theme is really just slapped on the game; you could literally replace the door with anything and you'd get the same game and the doors don't show up as any mechanic in game. The "what's behind it" part loses all the interest when the game is either infinite or takes a really long time to beat.