It's too old concept to put it without innovations. Headshots, buffs, boosts to speed, see thro walls, short tutorial with much smaller level, summon lesser pacman to eat for you and assist, hotkeyed abilities that grow with each level/score - like immunity to enemy for 5 seconds with cooldown. It has to be fun, not like this.
when i play last level in firelands with boss and place two boomerang towers in first possible spots, game crashes - sprites won't move, level won't end. Its a bug.