Thanks for the report! I'll investigate if/when I can get access to a machine with Chrome. Is there room on your display for the additional rows, but instead you see empty space? Or are the missing rows off-screen and you just need to scroll down, but you can't? (I did implement a scrolling fix shortly after launch.)
By the way, each level is identified by a square size, like "10x10," but it will re-flow the tiles into a tall rectangle instead, when needed to fit on small displays. In that case, you might see a "10x10" level having only 9 (or fewer) columns across—but you'll still get the full 100 tiles, due to there being more than 10 rows vertically.