Yes, controller support is in the plans.
BTW, what's your FPS when you're playing? One of the limitations of the in-browser play is that it might be a little laggy in full screen. It's easier to play when FPS is high.
I didn't play in fullscreen mode, so I didn't notice any lag. As for the FPS, I'm not sure as I didn't check, to be honest
Try it now, I added mouse/trackpad support. This way the controls are much better!
