Welcome to Halforums!
I wish you luck in your adventure, it's going to be a hard uphill climb to getting syndicated if that's your goal. There is precedence for a strip that goes back and forth between mild humor and sappy, for instance Family Circus. That comic is perhaps even more relevant to you as it also seeks to explain the actions of children in some cases. Most successfully syndicated strips, however, are very consistent in the level and type of humor. Calvin and Hobbes, for instance, when it did approach sappy subjects still wrapped them in the same humor found in the non-sappy strips.
You're going to have to be a lot more ruthless in cutting out the bad, poorly executed, or tired ideas. For instance the strip that is something along the lines of "I'm going to go on a big adventure! ... Oh yeah, I can't cross the street by myself" is not particularly new or engaging, and you didn't add anything to that joke. You may have to take more risks in order to put your own spin on these subjects, and let some ideas sit for awhile until you come up with a uniquely new, interesting perspective.
While it may be important to you to keep the design aesthetic of your site, keep in mind that avid online comic readers generally expect to see arrows or "next" and "previous" buttons for navigation through a comic. Also, in english (or perhaps just american english?), the word "episode" is not generally used to refer to a single comic strip. That may be part of the confusion. If you intend to keep all the strips on one page, consider using the word "archive" or phrase "all strips" when linking to that page.
Keep at it. Most "successes" happened only after years of performing their craft and honing it over time. Keep doing it and you will grow your international audience and may find the success you're looking for. If you update regularly and have a single URL that shows the latest strip, you will gain an audience that comes back on a regular schedule. It's best if you can keep it up daily, or several times a week.
If it's just a portfolio site, and your only purpose is to showcase your work until someone decides to buy the rights, then perhaps this is sufficient.