Deceptively tricky! First of all, I'm digging your spritework! Did you make them yourself? Because they look adorable! The mechanism translates itself pretty well without any need for a tutorial. And just as I thought hey, this is cozy . . . the third bot delivered 3 instead of 2. I also like how the music matches the on-screen movements. Overall, amazing game.
If I had to add anything, I'd say a bit more bells and whistle. maybe some animation on the right end of the screen or something. Because the mechanics are very fun as they stand.