@Cryptics: Use the k key to shoot spikes through the wall after you have ran over the spikes to collect them (or something like that, if I remember correctly).
I love this game, but it makes me sick...literally. I don't know if it's the frame rate or what, but I can't play for more than 15 minutes or so without feeling woozy/nauseous. Anyone else experiencing this?
The game is fun, but I gave it 2/5 because the levels are seemingly infinite and the boss is super hard to find...I gave up after a couple of hours...also, a little too easy to kill other bubbles, but a good idea