Are there more than two endings for Highrise Heroes?

I've reached the end of Highrise Heroes, a word-building game kind of like Bookworm, but (usually) limited by turns rather than time, meaning you can be more deliberate.

The game sports a choice near the end, which result in a slightly different final level and a different cutscene at the end. I've gone through both of those. Now, while I've done my best, I haven't three-starred all of the levels and I haven't gained all of the achievements, things that sometimes unlock further endings.

Poking around on Google, I haven't found anyone mentioning more endings, but I figured I'd ask to see if anyone knew if there was any benefit other than bragging rights to get three-stars and achievements.