Thank you everyone for your comments . I will release a new version of this game after ludum dare so I really appreciate your suggestions.
@pl0xz0rz sorry about the screen size, that's why I uploaded two different jar versions with different sizes, however, you can still resize the game window to fit your screen in java, and as @manuq said, you can zoom out the html5 version too. You are right about the most common cause of death, I suggest you stay away from the borders of the screen, I will improve that on the new version.
@hypp nice suggestion, it didn't occur to me
@NuSan at first I wanted to add more bomb types, but I thought that the key of this game is that is "simple", but I will keep your suggestion in mind for the new version.