about perspective but also includes a bit of animation basics...
but what you included was only a 1-point perspective using only one vanishing point...
there are also other techniques in perspective that add beauty to the art like the 2 point perspective or 3 point perspective...

a little overview:
2 point perspective includes all the elements in this tutorial with a little addition. Instead of only 1 axis with intersecting points, you use two axes...
It depends on the angle of the view you are portraying...
Example1: you are at the upper left, so you put the vanishing point for Y at the bottom and Z at the top...
Example2: at the direct corner, you use 2 vanishing points for the X axis. one at the left one at the right.
And many more, just learn how to picture out...

3 point perspectives are quite complex but I use it only when the view is from an upper corner.(1 VP per axis)

well, thats just a little suggestion and addition... hope no one minds...
Good luck and great tut by the way...

Question is, how did it get to 9.5 MB? wew...

Well there are many games like these but this one was bit bit challenging...
Level 27 and 29 were the tricky ones and level 30 was just confusing.
I have to say that level 29 gave me the most headaches though... But the game can easily be passed using algorithmic patterns...
My technique is usually looking at the pipes with 3 ends then the pipes with 2 ends then analyze where the power source should start...
Took me about an hour and a half to finish the game with 43329 final score...

Tip: its like playing sodoku, you cross out first what isnt a solution to the stream... Or crossing out what you are sure is wrong...

What bugs me is that level 10 and 20 cant be played on NG... I mean, whats the difference? did you just want to give people a reason to visit ur site?

Well, thats that... As for the game, graphics-9 sound-9 gameplay-9 replay- 7
so my final score is 5/5 and 9/10

It was good but... the square said "Im a rectangle and youre a square"
thats the error I found in there...