I managed to complete only two levels. The art style is nice and the platforming challenges are interesting. Overall it has good potential and with a little more polish, it would be better enjoyable. Nice work!
Below are a few things I would like to bring to your attention.
1. I fell on spikes too often as they were slightly hard to spot.
2. The character collider being bigger than the sprite is useful for jumps and climbing like 'coyote time' but it is also leading to deaths since the collider is touching the spikes while the sprite is only nearby- this feels like an unfair death.