This is a kind of tetris game, but rules are bit different.
To remove a block, you need to make a consecutive block.
(The row and col of the block has to be at least 3 cells.)
Or, make a consecutive row. Use bombs wisely. A bomb removes cells with same row. Green cells come down as time goes by. If a block collides with a green cell, it is game over. You can stop the progress of green cells, by removing blocks.
(By creating a consecutive block or a consecutive row. A bomb does not work in this case.)
I wrote a blog about this game development.
If you have time, please read my blog, as well.