This game was made for me its amazing and the puzzles are actually challenging with no need to guess!
NEVERMIND THE ISSUE WAS MY CONTROLLER WAS CONNECTED! Game is perfect :)
One issue i've noticed is that the game seems to stop following my cursor at random points, sometimes its right when i start the game other times it would be working then the next puzzle i do it stops. This causes me to have to click on every tile first and i can't click and drag or put down an X or mark tiles unless i click on it first causing me to fill in a tile which can cause accidentally fills and just adds jankiness to an otherwise perfect game.
On linux (Ubuntu-Mate) using Faugus Launcher!