The score on my game to beat is 25602. This is obtained around level 3 or 4. It just depends on if you try for score or just beating levels. Some scoring tips is when you're playing the grid game, don't just go to the center. Try and shoot bugs until the time is very close to 0. Also, when you're on the MCP (block) game, if you shoot all the blocks before you reach the top, it gives you a 1000 pt bonus.
Also, an easy tip for the high score (or just to get on the leaderboards, if that is your thing), is to get to level three with your first life, and hope you can get the bugs on your first guess...if you do, spend the entire amount of time killing them, and when you lose, repeat...thanks to skuzzyb