Thank you so much for the elaborate feedback!
It's good to hear someone with motion sickness not have too much of a bad time with it, though I agree it's definitely something to keep in mind whilst developing and also something for me to improve upon. Making games inclusive is a good thing!
There are definitely ideas for mechanics that could have been introduced in later levels to keep things more interesting, such as different types of soil. It's something I would have implemented if more time was available, but I decided to keep it like this for simplicity both in my side and the players'. I did try to make the levels fairly different by exploring some ideas that come from the "move closer to the center to circle around faster" mechanic, but yeah, more mechanics would very probably be a better idea!
Once again thank you for the honest feedback, I appreciate that a lot! :)