Every bomb you set increases your chance of death.
Use bombs defensively. In the beginning, use them to block off a path so you don't have to worry about it (especially with more than one bomb). Later on, if someone is approaching your hiding spot to avoid blasts, put a bomb down so they can't walk on it.
You are invincible for 3 seconds after spawning. Use it if you're lucky to get some kills, lighting your bomb from another bomb, or trapping people. (I hate this and you will hate me.)
Stay in the bottom center of the map. Move slowly, except when you can see the length of an entire lane.
Kill afkers. I don't like it, but it's part of the game now.
Always run away from other people if possible.
Trying to kill a specific person with just your own bombs is pointless, unless they just spawned in a locked corner and you've got tons of powerups. Instead, assist people who are setting lots of bombs in a line in suiciding.
I haven't seen Kyaramaru play in a while. Has he fallen like MissKitty?
Spam bombs like hell. There are no tactics :(