In my opinion, the game should add some more mechanics, for example, an upgrade system like a roguelike or an evolution in the challenge (random event that will discombulate the player)
The biggest issue is the balancing of the game, sometime, i have 3 birds at the start, at another start, i can have 10 birds to memorize.
With more polish, the game concept can be greater! Good job on the design, they rocks!