Beam me up
I found a way to cheat so I looked at some reviews to see if someone spoke of it but all I saw was "tab + space" I tried it and it didn't work, so yeah the cheat consists of right clicking and putting your cursor where you want the dot to be then press "alt", you now have a teleporting dot. You might want to fix that.
Other than that well I'm biased since I love those simple puzzle games that are challenging and got simple graphics so nothing to say about that. Adding sounds effect and better music would add to your game tho.