The game idea is unique, I haven't seen anything like this.Controlling birdy by a mouse was unusual, but later I got used to it.Cage walls add more challenge to game.Also, moments when there are a lot of guns shooting require some of tactic making, like when to wait for guns to shoot or in which direction bullets are flying.The long level was boring.Now about visuals: sprites are looking good, only one thing I would like to see is floor sprite, instead of just gray color.About gameplay: I would like to see more elements, like saving more than one bird, or different types of guns(plus adding a clock that would give extra time, so the game won't be that hard)
Overall, very great game!