I got stuck on the one before the spider but I assume you were on the penultimate one as the loading screen shows 16 levels, the spider is 15th.
nope ther several ones after that, some wothout moving balls telling you its all over, then one more level in the shape of a t-rex which I can't complete
Cor a computer game I can beat Grom at
i'm now on the t-rex level – grrrrrrrrr
Completed the T-rex – found the spider more difficult – started seeing it when i shut my eyes.. there are a few non-levels .. last one has no balls and no gauge.. there is a secret mouse pointer change code – but i wasn't clever enough to know the answer to the clue about the Japanese wave .. looked it up 
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ah – I managed to finish this (as much as you can) only because my browser stuttered every 3 or 4 seconds which gave me enough time to make a slice when it was frozen. A cheat but it did work.
The Japanese for small wave is 'Konami' (opposite of Tsunami) and the old infamous Konami cheat codes of up, up, down, down, left, right, left, right, B, A gives you a lightsabre which is nice .
Spider gave me no problems at all but hated the dino!
anyone any idea how many levels there are, i've done up to the spider before i gave up