This was a lot of fun. Honestly not a lot i can tell about what to improve in a infinite auto runner game. I think music plays a huge part in such games, so not having it definitely a negative but im pretty sure you already plan on putting in music. Also i think increasing the frequency of the slimes as your score goes higher is quite, while also making the game scroll faster. Lastly, a score history of at least the current session would be nice, idk how hard a leaderboard would be to implement to give that as a suggestion. But overall its great fun.