My score (as a single guy controlling both characters) is 101 :)
This is a nice little game, with a pretty original setting. Those characters have really cute animations that make it pleasant to jump around and fix stuff!
The gameplay works well, especially with the little detail being that Flame and Cement must not cross each other, not to solidy Cement any precious seconds. With the hectic endgame it becomes a really important detail :P Make Cement run out is also interesting to prevent dumb tactics like each character taking the left or right side before swapping.
Side note, I found a way to cheat: https://marwane.kalam-alami.net/img/index.php?f=15978bab0ebdc4 That should be easily fixable though ;)
If I were to suggest something, it would be to make the difficulty a little bit more challenging from the start. Also as improvement ideas, the game looks like it could become even more fun with power ups, and maybe random disasters to prevent?

I would also have to give this a 101/100. I love the use of the theme, and that you have two characters working together which are totally incompatible. There's something very poignant about Cement hardening whenever they come into contact.
The art is really charming, the music is great and as a whole it's really entertaining :)
I think it works well as a small game but if you were to extend it, it might be interesting to see new levels with their own unique challenges and traps, or just designs which made more use of the interesting mechanics.