Two things I've noticed: while the app supports landscape, the splash-screen is portrait only. Harmattan allows for both.

Somewhat more substantial: when searching for "tree " (with trailing space) it says "no results found". It does list "tree" as first alternative though. Searching for "tree." (with accidental trailing period) lists the same alternatives, but all with the trailing period - which in turn yields to the same "no results"...

Alas, trimming the search input would be welcome.