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Reminds me a lot of Knytt and Knytt Stories created by Nicklas "Nifflas" Nygren [1]

You got me! I enjoyed Knytt so much, and it was the game that first inspired me to make the first version of Tuff way back in 2010 :) https://github.com/BonsaiDen/Tuff/commits/master

Yeah, I wanted to mention that too. The save mechanic is very similar.