I think line breaker is one of the better games actually, the hitboxes are somewhat forgiving and the speed really only ramps up when your progress bar does. So if you literally only go for the yellow parts you can usually get over 100 coins each time for about a minute of game time. Also since the line's hitbox seems to have some priority over the blocking walls you can actually break through them even a little past the corner where they meet.

I usually get around 90-140 coins each time and even if I royally mess it up going only for yellow lines I still get around how much I get for a full bar cat game (100 jumps).