Wait wait wait wait, so let me get this straight.
After beating the first quest, you sort of are transported to hidden places of previous areas, where you have to unlock the final 4 chambers, right? And the previous places are now harder, right? It's extremely easy to fuck up, and if you are in the middle of the level, you have to go all way back to beginning of the secret area to re-unlock the teleporters secret chambers, right? And sometimes it's impossible to return to the unlock room, so you have to restart altogether, right? And in order to return to second quest, you -spoiler alert- hold Q while clicking play to start the second quest, right? And when you do, everything resets to 0, all the previous chambers that you unlocked, you have to unlock again, right?
(It makes me genuinely wonder how the hell these few users managed to beat it)
The lack of basic load / save option is basically what kills this game and makes me feel that this game deserves zero stars.
But even then, there would be an easy solution for that - either remove checkpoints from the harder second loop, or maybe, if you start second quest, have the 12 chambers unlocked instantly, when you start second quest. Or maybe just don't make games, as you seem to be pretty much self-aware. It's not like any of your other games are enjoyable at all.