Well, I was going to comment a few days ago, but it kinda slipped my mind. But, yeah, it is a shame considering the mechanics of the game are fun, challenging, but very fun to go through in a speed-run once you master it and figure out you can shave time off you run since you can still enter doors while paused
. If there was custom-made levels, well, the longevity would skyrocket...and considering Tower of Heaven had a level editor in the Flash version...
Either way, it certainly deserves a lot more attention. And the soundtrack is worth a listen to, too.
As for the secret ending...being what it is
, I generally have my theories.