Particularly on the final level, with many enemies on screen, the start of the stage slows to a crawl. This makes it more difficult, since you can no longer judge well how long the bombs will take to go off. Instead, you have to learn times in terms of the distance you can walk.
Still, I managed to complete the game with a minimum of lives lost. I've completed it before of course; attached to the manual was a post-it note with a few passwords, the last of which was 0515 which corresponds to the final level.
I then moved onto the battle mode, and tried to remember what each type of louie does. The pink louie appears to dance. I set the green bomber to be a fat one, and he won the first set of games and almost won the second. I snatched victory in the final game.