This game has a nice idea, but the execution is a bit rough. There are two main issues that prevented me from really enjoying it:
First - the switch between characters can be very jarring, especially if you are moving when it happens. The character you switched from loses all momentum, even in the air, and the character you switch too moves before you can even react. I would recommend needing a new movement input after switching, and maybe not switching while you are in the air to help with this.
Second - the hitboxes for some of the hazards feel a bit unforgiving. This is especially painful since the movement feels very slippery and you can't vary your jump height. This compounds with the first issues when characters stop midair during a switch and fall to their death, or slowly slide off of obstacles while you can only helplessly watch.
Sorry if this is too harsh, but I feel like this idea had a lot of potential, and I feel like I would have quite enjoyed it without the above issues.