"Best to play on tablets [...]" is a severe understatement. When the game first loaded in my browser, I couldn't even see how to move, as no keys do anything. The game window wasn't showing everything, since I tried going fullscreen to see if maybe I was missing a menu or something, and that's when I finally was able to see the controls - clearly a touch-only system, because that control is definitely not something you want to use with a mouse, or worse a laptop touchpad.
Might be interesting, but I doubt I'll try it on my phone to find out. And needs an obvious note that it's intended for touch-only.