I loved the sound effects (especially those birds in the background) and the controls of the walkabout mode. Unfortunately, I couldn't understand the minigame. I know it's Pipe Dream. I know how to play Pipe Dream. What I don't understand is how to experiment with it and figure out what the controls are without the minigame suddenly ending. Did I win? Did I lose? Is it a bug? No way of knowing.
(Come to think of it, that beautiful main menu was tough to figure out, too. I clicked everywhere with the mouse, then instinctively tried WASD, before figuring out it was the arrow keys. Maybe this game just needs non-diagetic elements to supplement the UI?)
Web optimization felt a little weak. Have you tried reducing the physics update rate in the Options and turning on Physics Interpolation? Pre-caching the sounds would have been nice, but since it's not an action game, the hitches at the start that only happen once aren't a deal-breaker, just an annoyance.