I made this minigame for a competition a long time ago. Soon after the competition was over, I added more things like Piantas. Haven't touched it in a while except for crossing out my website's link, which has changed and no longer has games.
All you have to do it mouse over (or spray) things to defeat them. Don't hit Peach or the Piantas, because they take away life (and in Peach's case, all your points). Likewise, picking up a 1-UP gives you life and picking up a water bottle fills up your tank by 6% of its total capacity.
There are NO differences between the players, gameplay-wise. You'll notice the music does differ between the two.