This is amazingly well polished, congrats! I like how you've explored variations on the core concept to build out the mechanics, and you've done really well on all the smaller details, like having the elements gradually pop in when the level loads. Having a fast forward on the bombs counting down is a welcome addition too!
I would perhaps suggest re-ordering the levels so it has a more incremental buildup of what mechanics are available - levels 3 -5 introduce many mechanics back to back before they are actually used in puzzles ( in the case of twin fuse, I don't think it ever shows up again?) Both ways, you've gotten a quite rich set of mechanics and I'm definitely following to see future levels if you go down that route.