Very fun, original concept! I love the core idea of combining characters to get new/better abilities (double-jump in this game's case). You could have lots of depth with that
The magpie character art was 10/10, and I really wish the rest of the game was drawn the same way, as opposed to having the pixellated background. Also I wish there were some kind of UI to help me tell which magpie was which, because I lost track after joining
The controls were a little slippery, but once I got used to them I could move around.