Gloomy Rabbit - Emotional Flig, developed by OoolRabbit, is a free game available on Android. The game is perfect for a rainy day as it has a melancholic vibe to it. The premise is simple; the player takes control of a depressed rabbit with an umbrella and jumps their way up to the end of the sky. The objective of the game is to avoid the ghosts haunting the rabbit and not to look down.

The game is easy to play and only requires one hand. You can play it anytime and anywhere you want. It's a great way to spend some free time and feel the mood of a rainy day. However, the game does require access to files for saving game records, which is something to keep in mind.