Maybe it's just me, but that sudden flash after you manage to connect is very hard on the eyes. Great game but definitely headache inducing if played to long at once.
The mouse keeps sticking and thus you are unable to move to be able to shoot the creatures. However, as soon as you move the mouse off the game, the mouse works just fine.
for level 13, use one belt and turn the ball purple. remove the belt and use the other one, turn the ball purple. then use both belts and turn the ball blue.
level 6 place the belt that goes around the middle on the white ball. Turn ball blue and place the other belt on over the first one. then turn the ball purple.
for level 8, turn the ball yellow. Place helmet on the ball and turn bottom half orange. Remove the helmet and use the metal piece with dots to cover the ball and dip it in the blue.
for level 19, put the flowers on the ball and spray with water once. Place the helmet on and spray until the bottom flowers are gone. Remove helmet, add grass and spray once.