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THE GOOD (what i liked, and what stood out for me):
The game had a unique mechanic and allowed for you to chain what seemed like a rage game into a nice little rhythm based package! The music was fun, the artstyle was nice and upbeat. The difficulty curve was lenient and difficult, allowing for the player to actually get a full feel for the mechanics without dying inside XD
THE BAD (what i disliked, the bugs, and other problems):
I feel like the game could have been better if there were more unique obstacles, such as moving platforms, or different songs for each level perhaps. Maybe you could include some more various people to connect to? such as ones that let you jump and move twice?
THE HARSH (stuff that would just make the game better, usually just personal opinion, don't take it too heavily :D ):
I think you should have a better indicator for when you make joins with people or when you die, maybe add some game juice, that would make the game feel more satisfying, which is something that players would want if they are stuck on a level.
OVERALL: 5,4,3 amazing game, great work!