Really doesn't feel like a game more like a test of what you could make

I mean... I do see the very beginnings of a game here. But as someone who has played around with Unity a little, I can also say that this is very, very, VERY basic stuff. Seriously, I could more-or-less recreate this in about 2-3 days.

In essence, this seems to me more like a test run of the basics of Unity game-creation than anything else, even taking into account that it's still in early development.

If you could expand this (and I mean REALLY expand this) this could be a fun free-to-play mobile game! Maybe add more levels, a random daily challenge, a shop of some sorts, and so on, I could see this blowing up! (in a good way)

I really like it. You're on a good way to make a proper mobile game.
We used to play that game with some friends, try to look at it:
https://www.y8.com/games/slope

Well, I know this game is pretty simple to make in Unity but the gameplay is okay. I didn't get to the end – is there even an end, or does the track simply end after the "U-shaped" ramp?
When the ball falls, I think you just move it back to the starting position instead of restarting the level because you retain your speed. But it doesn't cause a problem; if anything it helps you because you are already fast enough to make the necessary jumps.

Although because of the camera angle, you never know what's coming because you don't see it until the very last moment. A newcomer to your game will, therefore, have a careful approach, until they find out you need to roll really fast to make the jumps.

And also even though the camera can be rotated, the "forward" direction of the ball never changes which means it could just as well be a fixed view. It works in this game because you only ever have to roll forward, but if this was a maze or there were more directions to go, it would be really annoying (i.e. try to move the ball with the camera rotated by 180°).

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Edit:
The game was updated and most of these aren't a problem anymore (I increased the rating). It's still pretty short and ends abruptly, but at least there's a sign explaining it now.

It could use different kinds of obstacles. Now it mostly focuses on speed and there's just one kind of surface – there could be something like "speed up/slow down" ground, "trampoline" ground which makes you jump up automatically, "lava" which you must avoid, etc. Just something which makes the gameplay a little more varied.