This artstyle is cute! I also like the core puzzle gimmick. It's simple enough & lends itself to a few neat ideas, but I think you could absolutely have benefited from more levels & mechanics. Micromanaging 2 player characters at once is cool, but after that diagonal symmetrical level (2nd screenshot) kinda stumping me for a bit, the puzzles thereafter felt a little trivial and I felt like the game ended a little too early for my tastes, and I'm unsure how much you can get out of a mechanic like this on its own. Some experimentation with different fuse types or different floor tiles could maybe open up the realm for puzzles here.
With that said, I'm probably more of a puzzle game freak than most, so my opinion might be a little skewed. At the very least, if you ever choose to expand on this concept, I'd love to see it.