Love the graphics on this one, it's really a gem of gameboy graphics right here. Even the game sprite of the duck is simplified just right so it doesn't look so underwhelming compared to the kickass duck in the title screen :V Another great thing are the effects, the little screen shake when the raindrop hits is just a lovely touch!
Gameplay is simple and nice, but it's overall pointless. It could at least have some sort of ending(I reached the right side of the field and it just kept going). But it's a very fun prototype.