Glad to see more people using Godot, that's always a good sign! 😄
The game's quite enjoyable, it kind of reminds me of Snipperclips for Nintendo Switch, and I think that if you develop this prototype even further, you can make yourselves a place in the market, good job!
I have to admit that I'm not a huge fan of being slower while jumping. I've developed quite a few platformers in the past, so I'm really strict in the gameplay aspect of this kind of games, but I also understand that the main focus is cooperation between characters and resolving a puzzle. Nonetheless, my advice is to refine a little bit more the movement system of the characters, make it feel a little more natural while jumping, so you can take the next step in quality 😊
You have done a very good job, keep improving guys! 😃