Pretty good.
At first, I was annoyed that every death sends you back to the start, but it seems like the level order is random, so it doesn't matter that much. Although some levels are harder than others, so there's some luck involved, too.
I'd experiment with the right click to see if the game would be better if you could also turn into the opposite direction depending on where you click (i.e. turning clockwise when clicked in the right half of the screen, anti-clockwise for the left half).
Sometimes you can get stuck when you run into a wall and then you can't slide along it, but have to return a bit which is time-consuming. Would assigning a zero friction physics material in Unity help?
One time I finished a level with zero seconds left and died instantly when the next one loaded (before the additional time could be added).
I also think you could zoom in a bit, because usually, the level takes up only roughly a half o the screen. If the levels get bigger or more complicated, I think I'd appreciate being able to rotate the camera (e.g. by holding the middle mouse button and moving left/right).
The sound effects seem pretty muffled in comparison with the loud music.
And technically, it's possible to get the same level twice in a row. I'd prevent that from happening.
An idea for a new game mechanic might be moving up/down or being unable to stop moving in some levels – but introducing new mechanics is harder when the level order is random. But there could sometimes be an optional collectable item in hard-to-reach locations which would replenish your time. Or multiple connected islands. You decide if any of these would improve the game.
Overall, it's a pretty fun game for a while. I'm not sure about its replayability, which should be the main concern in an arcade game. Perhaps randomize more things than just the level order and put something interesting at fixed milestones (e.g. a larger level at 5th, 10th, 15th (etc) level milestone) to give you something to look forward to.