Synopsis:
The Five Island Paradise, which consists of 5 islands connected be small, hub island or sorts, was taken over by five Emperors, with one controlling each island.
It's up to a single Toad to come to the rescue and bring these islands back to their previous state. Upon defeating each Emperor, you'll recieve a Key. You'll need five to open the mysterious gate they've built.
TatEI consist of 5 worlds with a mini-world between each of them which consists of a Castle which acts as a Hub and the aforementioned Gate, though you will start of one of the 5 worlds for story purposes.
The 5 Main Islands:
1. Resort Island (Your starting point)
2. Jungle Island
3. Cloudy Island
4. Frosty Island
5. Industrial Island
Each island, excluding the first, will consist of about 5 levels each, including a Town with NPCs, and the Emperor's Castle.
Resort Island, for example, only has 3 normal levels, a Town and a Castle.
Screenshots:

Resort Island is about 50% done in terms of levels, but still needs things like more yellow tiles for the beach levels.