Hey, thanks for playing :) I'll look into the spacebar thing. One of the downsides to webdev and being poor is not being able to test on every device, haha. One day!
To answer your questions, we (2-person team) will be making even smaller webgames in the future (rotopo plus its engine took us around 6 months), hoping something sticks for long enough to power us through making a webgame that isn't so traditionally attritional and casual. As for where they get played, anywhere would be great. There's (obviously) the game's homepage but we're always looking to get featured on any of those webgame aggregator sites too.