Overall a neat idea, and always love a good local multiplayer game, so I am excited to see how this one pans out, it sounds like it could be heaps of fun! Reminds me of the days of playing Portal 2 with a friend, co-oping my way through levels, and sometimes trolling.
It will be important to ensure that there aren't moments in the game where both players feel like the game is too hard or not-fun due to the combination of their abilities/the level. This might be unavoidable, but should at least be considered.
There's a lot of content described here, with 3 distinct platformer controllers (most people are obviously only doing 1), local multiplayer controls (maybe the need for a ui to go with this for character selection), a wide range of level types, and puzzle design. I encourage you to list out everything that you think is core to doing a "Vertical slice" of your game, and prioritise those things, while at the same time doing the game modelling process introduced in the lectures to understand the feasibility of some of the things you want to make with regards to your time available and skillset.