I think this game is fairly quick and easy. Nobody should have problems solving it without walkthroughs, so please only use this after you've tried to think the solution(s) out yourself and you're stuck.
There is often more than just one solution, so don't be surprised if you find out another one.
The walkthrough is complete (as of 2015/10/02), with all 30 levels present.
Use it without hesitation if you have any use of it. My pleasure.
Though, please, don't just copy it and claim it as your own. (Almost) everything else is allowed.
Should you have a question or find a typo/mistake/anything else you'd like to point out, please, feel free to comment/ask/correct me.
PS: If you want to be sure that I'll answer you, mention (@helpo1) me.