I really enjoyed this! I love a good puzzle game, so this was right up my alley. The mood of the game was solid, and felt like a classic arcade game. Although, I did stop after level 3. I think a tutorial or some hints about the pieces / mechanics in the early levels would help teach the player how to get farther.
It felt familiar enough to where I understood the basics right away, but foreign enough where it wasn't a clone of anything I've played before. After seeing this submission, dominos seems like an obvious choice for a "combo" game, but it's something I had not considered. The addition of a level editor for such a time-constrained project was super cool!
I appreciate the difficulty progression throughout the early levels. With that being said, I only got through the first 3 levels before I couldn't figure out how to continue. Maybe something went over my head in the early levels. For that reason, I think a dedicated tutorial, or some accompanying text in the first few levels would help teach the mechanics a little more effectively.
I dig the graphics and audio, they work together to make it feel like a classic arcade game. A few more sound effects and visual effects would really drive that feeling home.
"Humor" is hard to judge for this game, since it's not a comedic game. But it definitely has character to it. I still see room to expand on this, too. For instance: what's the story behind each of the domino characters? This is something I'd like to see if you continue with the project!
Great job, it was fun to check out :)