Thanks for playing! It was very enjoyable to watch you struggle with my nonsense.
I hope to remedy most of those bullshit jumps by compressing the levels somewhat and adding some lookahead to the camera. They're mostly a result of me rushing the levels for DD and not keeping the low resolution in mind. Only having 10x9 tiles of screen space really limits what you can do it turns out.
The inertia stems from the code being adapted from an earlier Cave Story like game I've been working on so I just kept it around, partially because I like how it adds to the difficulty. I'll try tweaking the movement some though, the inertia is definitely quite a bit heavy at times.