Liked the artwork!
Too short of a game, and the animated hints you gave were pretty easy to know when the Dragon was going to attack.
Check out the old game Dig Dug for some inspiration about how you could possibly add enemies or surprises hidden in the ice. Like: is the next block going to spawn an enemy? Give me a bonus? Push me back up 3 or 4 blocks?
Maybe try adding a time limit so it feels like an impending doom if they don't rescue the people in time ;)