The arrows can push each other. So you can use this to get an arrow that "moves only right" to the left of the dot.
Or you can bypass all of that with the unintended solution shown in this guide: Steam Community::20 Small Mazes
FLEB
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It's a tough one! The easiest way to solve it is to work backwards.
This person also shows where you have to put the character at each step: Steam Community :: Guide :: A step-to-step sliding puzzle guide手把手教你解滑块拼图
I'm glad you enjoyed it!
As for the size of the game, I did some optimization on the game's files a while back (mostly switching audio from .wav to .ogg, also deleting some redundant files) and managed to halve the size of the game. That's why it went from 153MB to 71MB!
And thanks for letting me know about that bug. I will add it to my list!