**1. Introduction of the game:**
Rest in Pieces is a surreal and spine-chilling mobile game where the primary objective is to guide fragile, porcelain figures through nightmarish paths without letting them smash into obstacles. This game uniquely blends the elements of horror with a whimsical yet eerie atmosphere, setting it apart from traditional endless runner games. It requires players to swing these delicate characters from side to side, dodging looming threats in a twisted dreamscape, all while trying to save them from a shattering demise.

**2. All characters and levels of the game:**
Rest in Pieces features a roster of characters each with its backstory and connection to the nightmare they're trapped in. These include fearsome clowns, mythical creatures, and lost souls, all immortalized in porcelain form. Each character has its level - macabre dreams from which players must try to awaken them. The levels are designed with increasing difficulty and varied themes, from underwater reefs to haunted houses, providing players with fresh challenges and environments as they progress.

**3. What attracts users most to the game:**
Players are mostly attracted to Rest in Pieces for its darkly unique art style and the adrenaline-pumping gameplay. The delicate balance required to swing the porcelain figures just right creates a constant edge-of-your-seat feeling. Additionally, the haunting soundtrack and sound effects enhance the gothic horror theme, which is a draw for gamers who appreciate a dose of atmospheric spookiness in their play.

**4. Why it is popular:**
The game's popularity stems from its innovative mechanics which offer a striking contrast to more lighthearted runner games. It demands precision and calm under pressure, which provides a satisfying challenge for gamers. The beautifully grotesque visuals and the stark elegance of the porcelain characters captivate the players, creating an engaging aesthetic that's hard to look away from.

**5. The most difficult part of the game:**
The most difficult aspect of Rest in Pieces could be considered the advanced levels where the combination of high-speed obstacles and tight turns demand quick reflexes and near-perfect timing. Players must also strategically use the swing motion to navigate, which becomes increasingly challenging as the game introduces more unpredictable patterns and faster pacing.

**6. Strengths and weaknesses of the game:**
One of the biggest strengths of Rest in Pieces is its original concept, which is executed with top-notch graphics and sound design. This creates an immersive gaming experience that keeps players engaged. The controls are simple but mastering them is part of the game's appeal.

On the downside, some players might find the game's difficulty curve to be steep, which could lead to frustration. Additionally, the game's content might feel limited to those seeking a more expansive gaming experience with multiple gameplay modes or customization options.

**7. What other games have been developed by the same developer:**
Itatake, the creative minds behind Rest in Pieces, have developed several other games. Their portfolio includes titles like "Pukk," a high-speed treasure hunt game, and "Goblin Raiders," an action-packed strategy game. They are known for their quirky and innovative approach to game design, with each title displaying a distinctive art style and gameplay that sets them apart in the crowded mobile gaming market.