Nice game! One small suggestion: a place to see the previous versions changelogs after you updated. Sometimes I update and realize I didn't even look to see what's new now lol
I'll second this one! Make the already attained levels in to buttons to view what they are/were. Heck, I did not even realize the changelogs were for the *next* level (version) until I was already at 4.0. I was ignoring them as just environmental props until then.