Cool game! The core gameplay and overall game feel was really good. I got the hang of the game quickly, and found myself mapping out paths in my head. So good job with the gameplay system and communicating the same to the player. Probably 5 seconds was a bit on the lower side. But this also kept the tension in the game. The timer and background music makes you want to keep going. Visual feedback for hovering on cells would be good.
The color-based movement helped a lot. It's easy to quickly spot large snake-like paths of the same color, which I then tried to get into. And after that try and spot the next one, etc. Got a high score of 539k using this technique mainly.
This was one of the starts I got. Not sure if I can proceed beyond the three center tiles.
But this could happen due to randomness I guess.
Good job overall!