I just played and completed Jank 'N' Pon the other day. l enjoyed the time I did spend on the game, looking at the animations and love put into this short demo. For working on this in 4 months as students is quite impressive, for what was displayed. The controls felt tight and the humor made me smile a few times throughout playing.
If there was anything I would say I would like added it would probably be other dangerous obstacles or enemies. It was pretty easy to complete, but I am thinking you're still experimenting with other gameplay mechanics.
I have a question, I noticed there was an attack button in the game, did you originally have plans to add things to break in the demo? Other than that I hope you will continue this in the future, it gave me that Rayman Legends vibe!
Here is a video of my thoughts on the game!