I like the pixel art and the premise of the game but since it's your first game I have some feedback for you ❤️
- I would advice you to make rotation faster because it feels way too slow like this , making it faster would be way better
- not an advice but for the grass tilemap the dirt part gets suddenly cropped below and doesn't transition ( idk if u understand me )
- lastly maybe u can try making spikes lighter or giving them a simple shine animation to be able to contrast the tileset or background
- and finally when jumping sometimes jumps don't get register if u click even one millisecond before touching the floor, what many games do is something called jump buffering aka if u press before touching the floor for some frames the game makes u jump when u touch the floor
awesome and not bad for a first game