the 2D world wrapped in a 3D cylindrical tower is cool; it reminds me of the 2D sections in Mario Odyssey. the artwork and spritework is really nice, and the game overall is aesthetically pleasing. i'd recommend adding stuff to the background, though, apart from just a blank green field. for example, you could have trees in the background that slowly rotate along with the player, further selling the cylindrical illusion.
i also think the level design is a little lacking in creativity, featuring mostly long-winding corridors and such, making the game feel more-or-less like a glorified maze. still, good job on your first GWJ submission! consider trying my game as well!