Great to hear you both enjoyed playing, thank you so much! I have to agree that this jam theme has been particularly nice nudging towards controls that allow for one-handed or otherwise relaxed play. While it's unfortunate I ran out of time to make more content, it's nice to hear there's audience for some more.
I didn't expect the art style to become a part of the appeal, but it turns out picking a tight, small color palette can help a lot. It does however indeed hide the grass-colored powerups. I'm not sure if it's also the tiles being a bit busy, but using your feedback should get it to a better spot.
To lift a bit of the curtain, all the "physics" are being handled very explicitly, like traditional platformer controls. There's just the layer of spinning and simple traction going on, to where you can have spin independent of your momentum. You influence the spin, the spin influences movement, but every player state has its own tuning for how fast you spin and how much it transfers to movement.