Thanks for all the feedback; I'm still afraid that a major update is still a ways away because I've been so busy with life's happenings, but I guarantee that there will be an update sometime between April and June of this year. I hope to release a "version 1.0" near mid-2016.
Progress is being made, albeit slowly. There are three new karts all ready for the next update, and the next three tracks to be added are in various stages of completion. I've got a lot of big plans for multiplayer and redoing the UI, so big changes could be coming to the world of Logan Kart!
Sorry if you are disappointed, but thank you for your support, and stay tuned!