Thanks for the feedback, we're glad you enjoyed the game! We tried our best to make each level as unique as possible so it's good you don't think it got stale.
The camera can sometimes glitch out in web builds and also if the camera gets too close to a wall it is pushed away from it, likely having to do with that issue. And yes, the levels do get a lot harder near the end. 2-2 and 3-1 seem to be the most confusing to people who haven't played them before.