Really enjoyed the presentation. Only thing that was confused about are the boulder/ice ball things. It's not really obvious at first what their use is.
Thanks for your feedback! The boulder/ice ball is mainly used to crash the ice spikes. We planned to make a simple platformer in the first place, but later on we decided to add some puzzle solving elements. We will check what we can do to make it feel more natural later. Anyway, glad you enjoyed the game.