Impressive Title was kinda of a practice run for Kovu. Im thinking he wanted to see how well he could do, and what he could improve in his game making skills. Basically thinking about making a second game anyway. Feral Heart is the result of his practice and improvements.
Impressive Title was an open fantasy world while Feral Heart is more leaning to realism. We dont have wings or items. Items were taken because of Item Grubbers and Hacks. Wings were simply over used and basically a cheat for high places.
On top of that, Impressive Title was proven to be extremely easy to hack, seeing as there were SO many hackers. Feral Heart, (Im hoping) is much harder to hack. Besides theres no reason to hack FH. Theres no items this time. No reason to cheat. Yet.