I don't know if I played as intended, but I pre-jumped a few bits without the correct platforms, moved everything in place on time, and then finsihed it. Also got this nice bug. (The resolution on the web version could be better.) Nice concept!
Nice bug, i really dont know how is this posible.
I guess I finished the game at the exact moment the timer ran out.
Also, doing the levels in alternative ways is an intended thing. Nice that you discovered new ways to complete the levels.