1. Introduction of the Game:
Geometry Dash Lite is a rhythm-based platforming game that has captivated millions of gamers around the world with its vibrant visuals, engaging gameplay, and pulsating electronic soundtrack. Developed by Sweden-based developer RobTop Games, this game challenges players to navigate their avatars through a series of obstacles and spikes in sync with the music, all with just a single control - tapping to jump.

2. All Characters and Levels of the Game:
The game primarily features a cube as the main character, which players can customize with various colors and effects unlocked by completing levels or through in-game achievements. Despite being called "characters," the game's different icons only change the appearance and do not alter the gameplay itself. As for levels, Geometry Dash Lite offers a subset of the full version's levels, presenting players with a series of increasingly difficult challenges. Notable levels include "Stereo Madness," "Back On Track," "Polargeist," "Dry Out," and others, each with its own unique music and aesthetic.

3. What Attracts Users Most to the Game:
Players are particularly attracted to Geometry Dash Lite for its addictive "just one more try" gameplay, which perfectly combines satisfyingly challenging levels with the gratification of finally overcoming obstacles. The soundtrack is also a major draw, featuring catchy tunes that players find themselves humming long after they've stopped playing.

4. Why It Is Popular:
Geometry Dash Lite's popularity can be attributed to its simple yet challenging mechanics, its accessibility to players of all ages, and its ability to provide instant entertainment without the need for a lot of time investment. The quick restarts after failure make it easy for players to keep trying, contributing to an immersive experience that's hard to put down.

5. When the Game Was Released and How Many Versions Are Currently Available:
Geometry Dash Lite was first released in August 2013. Over time, the game has seen various updates, with new levels and features included in subsequent releases. While Geometry Dash Lite remains a free, scaled-down version of the full game, there are several versions of Geometry Dash available, including the full paid version, Geometry Dash Meltdown, Geometry Dash World, and Geometry Dash SubZero, each offering unique levels and music.

6. The Most Difficult Part of the Game:
For many players, the most difficult part of Geometry Dash Lite is the precise timing required to navigate through the game's most challenging levels. The increasing speed and complexity of obstacles as one progresses make maintaining rhythm and control a true test of skill.

7. Strengths and Weaknesses of the Game:
The game's strengths lie in its engaging gameplay, vibrant graphics, and catchy music. It's also lauded for its straightforward mechanics and the satisfaction players feel upon completing a particularly tough level. However, its weaknesses might include a potential for repetitiveness and limited content in the Lite version compared to the full version, possibly leading to less variety and fewer challenges for advanced players.

8. What Other Games Have Been Developed by the Same Developer:
RobTop Games, the developer behind Geometry Dash Lite, has created several other games in the Geometry Dash series, including the original Geometry Dash, Geometry Dash Meltdown, Geometry Dash World, and Geometry Dash SubZero. Additionally, the developer has worked on projects like "Boomlings," "Boomlings MatchUp," and "Memory Mastermind," expanding their portfolio beyond the Geometry Dash franchise.