Here is my attempt at a SVG/javascript version of a game similar to SunFlat's SFcave. Press a key to accelerate upwards, release your hold on the keys to succumb to the pull of gravity. The mouse (or a motion-capable smartphone) can also be used to direct the dot (move the pointer over the cave). The cave will reset after you crash and press another key in frustration. Reload the page (or change the seed) to get a new cave.
