Moonday

One night a UFO crashes somewhere in rural fields. Ushitsuki, local farmer (and a cow girl) finds the alien who now needs to repair his space ship using colors hidden in Ushitsuki's dreams.

Moonday is heavily inspired by Yume Nikki and shares some mechanics with it - exploration of dream worlds via going to bed, finding/equipping special "effects" which change character's appearance/abilities, etc.