funny game! however, every few seconds I have graphic errors, and i see some text on the screen, one of it saying "sample text".
As you surely know from games like Super mario or sonic, it s best to give invincibility items not a simple siren, but a music with a start and an end for the duration of the invincibility. this allows the player to estimate when exactly the invincibility will end, so he wont crush into an enemy right after it ends. Also, maybe set the moving speed after collecting a flower back to normal before it ends, for the same reason!
Otherwise, nice little flash :)