easy

That's an OK game. Visuals are bad, very few levels, but enjoyed.

the visuals hurt my eyes

Nicely done!

The graphics were simple, but the puzzles were decent.
The game starts off easy enough to teach the player what's going on, but then gets to the point where thinking several moves ahead is required.

Only negative really was that the game wasn't longer.
Even the minimalist approach worked well for this.

Controls worked, were intuitive, and responded as expected.

Fun game!

I know you say its simple but I still enjoyed it. If you were interested in updating it, I think there are a few ways it could be improved!

My main piece of criticism would be the movement - it feels just slightly delayed. If this was more responsive, the game feel would be much improved!

Some additional levels with more comlicated designs would be fun too - but great job for your first Unity game!