I put them all in end credits, except things needed to say now:

I. TIPS:
#1. No trial and error. A hint is given in all harder parts.
#2. No meanly hidden switches, holes or walk-through walls.

II. BUGS:
#1: Save after getting outside due to possible shatter box bug.
#2: Failed climb. Rewarded if found. Not counted as secret.
#3: Some spikes may be safe. Just ignore it.

III. EASTER EGGS:
One is with the ladder bug mentioned. Two other are special deaths.
Don't count as secret but You may want to find them anyway.

That's it. Now play or bin the game. Whatever You do, there will be trash.

With all the best despite of garbage given,
Maciej Skrzypiec, Official TRLE Dustman