Thanks for valuing the special effects :)
Yes, some level parameters could be tinkered a bit to raise the difficulty more as the game progresses. We we're afraid of raising the speed to high and player drop the game. But we learned a lot about making an "Engine" with many exports and just use them to make Levels. So I can't wait to reimplement this technique in a new game :)
The Win/Gameover dialog was pretty improvised as it was hard to implement it the right way. We definitely want to do this better in upcoming games!