Niice this was a lot of fun! I'm a fan of frog-inspired games and this one was surpisingly inventive! I liked how much freedom it gives by having the ability to drag the blocks and then "mine" them into smaller pieces.
In terms of constructive feedback, not sure how common this may be, but once I lost after making some progress (around ~15 lines), then it felt a bit tedious to start all over again with the slowest speed. I don't know what would be the best solution, maybe just a way to obtain extra lives? just thinking out loud.
That said, good job! I'll look forward to more of your games :)