Super well designed game, great entry! Like others have said it has that old school addictingames web game vibe, and I think it works perfectly for the Secrets theme. There's so many nice bits of polish, from the slight squishing of the character on jump lands, to the particle effect at death and so many smart game design decisions like a very short level restart time and checkpoints at each level. The art is a little plain but its cohesive and doesn't take away from the gameplay itself. The SFX are solid and juicy but a background track of some kind would have been a nice addition. There were multiple times where I had the "aha" moment and made for an awesome gaming experience. The first two levels I think are the perfect way to introduce the player to the whole "everything is not as it seems" vibe, without hand-holding or being too enigmatic. Proof that a game can still be great even with programmer art :) Brilliant entry!
edit: like others have said you should post it to web game sites, I'd try it on Newgrounds!