1. Is free (freedom / no price)
2. Is easy (no more brainpain to make a simple collision)
3. Modular (every map, object and etcetera is actually a lua file that can be modified in real time)
4. For al types of 2D games (Platformers, RPGs, Clickers, Spaceships, ETC)
5. Everything is compact. (the engine with LÖVE integrated is less than 4 mb)
6. Livecode. (livecode.)
and that's it.