The character movement isn't feeling too comfortable and additional actions feels a bit multitasking. Some obstacles require a bit too much accuracy, it's good to have a hitbox smaller than the sprite, but there Shouldn't be a point where the player character must get really close to the Spikes, because the player can't see hitboxes.
But the difficulty curve seems well appropriate. The in-game tutorial is simple enough to understand. The first few levels are pretty enjoyable.