Nice concept
I like the concept and pixel graphic, good game IMO
I suggest to change few things
-> make some warning that giving the baloon to the green guy will end the game (I didn't want to but I had no other choise...) or add option to keep playing (I could choose only to view ending or highscores)
-> make possible to go back and take other presents. I went forward and couldn't go back to the previous locations (I just didnt know which way should I choose and I picked up the wrong one before collecting the gifts)
-> add some achievments, info about the missing presents