I like how I had little idea how far I'd progressed, especially when hearing about secrets and gods from this thread. Mysterious.
I would consider loosening up the collisions, mainly because level 1 I opened the gate, tried to enter, and couldn't. Turned out I was hitting the nearby walls. My worry is that many players may think that the game is broken or they're not "getting it" and give up (and give the game 1 star or thumbs down or three farts, depending on the rating system.)