Decent game, but there should be an on-screen HUD with the 30 second countdown imho. As it is now you get the feeling of dead-man-walking syndrome while exploring. And maybe also show the power-ups you acquired, after the first game over all lives lost, it took me a short while to realise the entire game had reset instead of just one live.
Also, the intro text should really be skippable. I reloaded the page the first time and had to wait again for the unskippable intro to finish :\