I like this genre, the execution was great and it's well polished so it's one of my favorite game for this jam. However a game last for too long, I think it would be better and more fast-paced on a 4x4 grid (although I played waaaay slower than what's shown in the gif so that may be the reason). And quality of life improvement could be that after let's 3s of inactivity the tiles that can be activated shake a little regularly instead of having to check manually the 25 tiles.
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Thank you for your visit and suggestions! Regarding the size of the chessboard, I just intuitively set it to 5*5 and did not attempt to make it larger or smaller. But as you said, downsizing to 4*4 is indeed a way to speed up the pace (of course, this also requires more playtests); Shaking those activable tiles after a certain period of time is indeed very useful and I will add it to my to-do list.