hmm... It's pretty nice :)
This isn't the best game ever... actually, far from it.
Being such a short game, it is really best suited for quick and multiple playthroughs.
It's just that even though the game is very original (or so I think), it doesn't really... do it for me :S
It's actually quite a letdown, that the game only seems to have one stage... I'd say the entire game would improve with: Multiple stages, and a score that would increase based on how much sunpower you've collected (and perhaps how small an amount you were able to kill off the mosquitos with), and just a simple story.
All in all, it's not that satisfactory, and it seems that while you get more of a challenge for playing on the hard difficulty, it doesn't really seem to make any sense since the game is so short and there is not really a score to keep.
It is still a good little game though, but you might wanna try expanding it a bit, even though you were just looking to convert it from game maker to flash ;)