Nice puzzles! I thought level 3 was broken, but managed to squeez after fine adjusting the "mirror"!
I didn't find the extra level... xD
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Yes, I think adjusting the hit box a little bit to be more forgiving would be better. But beware not to decrease it too much and make it impossible to land on the other side!
Do I NEED the cheat code to find the level? I clicked a lot of places and tried to "walk" but to no avail... if I can access the level without "cheatcoding", I'll look for it later with more time!