Dirty and fast prototype, I think. It looks like Helix Jump. Is this just a prototype?

I genuinely love the idea, it's a good, fun game. I never encountered a disc which would be impassable, so props for that. You could even add an alternative "hard mode" which would only let you touch a disc once.

As for possible improvements:
– The top disc is always the same – good – but sometimes it's rotated in a way that you fall through to your death down below. Perhaps make the rotation of the top piece fixes as well?
– It's not good to make the players hold a mouse button for the entire duration of the game, I'd make it move left/right straight away without holding (or add a toggle, as suggested below).
You could also "lock" the cursor because now if you go too far to the left (or right), you could get stuck because you reached the edge of your screen with the cursor.
https://docs.unity3d.com/ScriptReference/Cursor-lockState.html
– Add SOUNDS. Sounds add a layer of enjoyability to your game. Try to play e.g. Mario with and without sounds to see the difference. Of course, you can add background music if you want, too.
– Graphics could be improved as well. Some faces aren't visible. I don't know if it's intentional, but I'd guess it's because of backface culling (faces are visible only from a single side, so you need to flip face normals).
– Add better background than a solid white colour (e.g. a sky)
– The score count isn't very visible

In endless games, it's always difficult to motivate players to continue further. But this game is fun; that kept me going for quite a while. You could also display the player's high score (to challenge him to beat it) or add a layer of competitiveness by posting the score to the Newgrounds public scoreboard, so players can compete with each other.
https://bitbucket.org/newgrounds/newgrounds.io-for-unity-c/
http://www.newgrounds.io/help/components/#scoreboard

Finally, I think the game window size you chose in the Project System doesn't seem right. Just use whatever resolution you chose in Unity (Project Settings/Player) and add 38 for the footer if you use the Standard WebGL template, nothing if Minimal.

Its a really fun game! Good Job!

The game is fun. My suggestion is to have an option so the user can click and the mouse is grabbed, and then released with another click, so the person won't have to hold for a long time. Also released if the user loses to click the restart button.

Cool game, but it would be cool if you could add a background