A neat little game. Very nice retro pixel graphics! I’d love to see the game expanded with more levels, puzzles, and a bit more variety. Nice work!
Also, when you build a game with Unity using the “Stand Alone” option, you need to build it 3 times (once for each platform). By default, you will only be able to build for your OS but you can use Unity Hub to install the builder for Mac and Linux. That said, if you build for WebGL you will get a lot more plays, feedback, and ratings.