I loved this game, especially the art.
But if I could give one piece of advice it would be: make it easier.
Most people want to masturbate while playing these games. Since most of the levels are very complex, it doesn't flow very well. Not to mention that for those who don't have English as their primary language, it's even worse.
Several mechanics require you to repeat the same thing multiple times, without it being very clear. Besides, having so many codes and passwords means you have to write everything down. Because, although there is a guide, it doesn't contain any of the passwords.