It just doesn't have enough substance. I got bored pretty quickly because all i was doing was touching flowers that appeared every few seconds. From what I could tell, the plasma bullets were pointless because all they did was cause beetles to explode into 8 bullets.
I don't know if extra powerups came around as you continue to play, but if so, they should come earlier because otherwise a lot of people will probably lose interest before seeing them.
The graphics were good though, so good job there. ^_^