Honestly, I've played plenty of little games which managed to keep me immersed with this type of minimalist artstyle. If your goal is to make a small game, then I would just go ahead and do it, despite your tiles not looking anything like Decroded's edit. You'll be happier with a completed game on your resume even if it has super-simple graphics. I know it sounds like I'm telling you to be complacent, but I'm kind of getting the impression that you got intimidated by Decroded's cool looking edit and gave up. My suggestion is to take that grass tile, add another complementary tile (maybe some blocks or stones) and show us a mockup of a hypothetical game. The key to making good, but very simple pixel art is how it all ties together, which is why mockups are more telling than individual tiles. Here's hoping you didn't give up!