The snail's movement is really satisfying, especially the sprint/rolling. Only thing is that when your apple storage is full, apples littered around you block your path. This isn't an issue once you get apple storage upgrades though.
I do think upgrade cost scaling is a little high at the beginning, but nothing out of the ordinary. It is quite tedious to go around gathering apples manually with no automation feature until you get the collection upgrade.
Overall, great game!