This is a funny game! "Water u doin?" is a hilarious thing to add when you hit someone with the water.
For some critiques, I think it needs a losing condition. As it stands the player will be able to play for so long that it becomes impossible to water all the flowers resulting in their score only going down, so there is like a parabola of scoring where youd be better off quitting while youre ahead. I also think adding a grass texture could give the game a much better look.
Good submission!