An good first draft.
There are a few issues I had with this game that really kept me from enjoying it as much as I could have.
1) You don't have anything in your instructions in the game itself talking about the secret areas, so I didn't even know about such a thing until I took a look at the page afterwards. Please include that right in there for those of us who like to dive right in.
2) Hit detection seems really wonky at times. Sometimes the entire cursor's graphic seems to be the object that gets hit/collects orbs, and sometimes it's only the front tip.
3) The enemies are probably my biggest issue. I liked the first level's obstacles because you knew they'd be hurting you, even though an "exclamation point" is kind of a weak concept for an enemy. But later on... fish, bunnies, cloudes! I don't know what's going to hurt me and what isn't half the time. It doesn't help too that certain elements in the background look big enough but don't hurt you (i.e. the other fish in the 3rd level). I just think that defining more obvious enemies or at least having something more out of place would make it easy to know what you're looking out for. Keep in mind that we don't really have the freedom of infinite lives to poke around and see what hurts you and what doesn't.
All in all a cool looking game and something a bit different. If you fix up those few issues I could see it being a lot more enjoyable/accessable. Keep up the good work.