What's the best iOS app for a relaxing puzzle game where you collect and merge creatures?

Merge Dragons! is a mobile puzzle game centered on combining objects to heal a magical land and collect dragons. Its core appeal lies in its straightforward merging mechanic, where players tap to combine three or more identical items to create new, higher-level ones. This process is applied to everything from life essence sprouts to the dragons themselves, gradually clearing foggy land and solving light puzzles. The game is well-suited for unwinding due to its lack of time pressure in the main camp and the satisfying, tactile feedback of chain reactions. Weekly events offer a change of pace with new goals and exclusive rewards. However, the energy system for challenge levels can limit prolonged play sessions, and some users note that later stages can feel repetitive without spending premium currency. Reviews indicate the game is particularly popular for its cute dragon designs and the sense of progression from building a personalized dragon sanctuary.