I think it would be a good idea if you had a hint somewhere on how to unlock Rudolph, maybe in the missions menu? Also, great touch in terms of character design by making a red bubblegum bubble represent Rudolph's red nose
Thanks for the feedback! I've taken your advice and added a hint to the mission list.
I'm glad you noticed the gum bubble. It fit in well with the rebellious character I wanted to make compared to the nice image we have of Rudolph the reindeer.