Decent Game, Simple and easy to understand what to do, I do think you can add more tooltips to point out some obvious aspects like equiping your sword in your inverntory when fighting the slimes, As to the regards of the flow of fighting people and progressing, I've been enjoying it so far, def gonna play some more when I have time ^.^ Will be interesting to see what you do to improve the UI and add to the game in time, you def could find alternative ways to expand it like allowing PvP duels or something so people can have fun or just more familar with the combat system

Handling could be improved a bit, but I do know they allow you to adjust some of the sensitivity around this, but there is only so much one can do, I do like the overall game design, UI isn't half bad, I do think better map choices or wider racetracks would be nice considering you slow the user for grass penalty etc, but the karts at the same time have hard throttle control considering how it boosts in speed considerably, but I know that can be and will be tweaked in time!