That was an interesting puzzle game, I don't think I have ever played one like it before. The tutorial made things straight forward for a game that I feel could be confusing at first.
I played 2 games of each grid density and I felt the game got easier each time as it become more dense. I don't know if I just got lucky, I feel like it could use some tweaking with how cells are filled.
A minor change I would make is how long it takes for the tooltip to display. It is short time before showing but those small amounts added up when I was trying to go over the board to see what everything does.