As a touhou player for ~2 years who ever got only 1cc in easy mode, I definitely love this game. The difficulty is pretty well dosed for me, the world overall really seems personal, as someone else said : There's no feeling of "I made that cuz it looks badass but idk what I'm even doin"
The major weak point I would point out would be the contrast between background and projectiles. The palette restriction makes it that I sometimes lose focus from my character because its color blends more or less with the other elements. For some reason, the animation of the road on highway also steals part of my attention away from projectiles, but the color issues overall will probably not be a problem anymore once I'm more familiarized with the game.
Besides, I love the palette restriction at the end, and the music (Megadrive VRC7? Idk) definitely fits well. Plus, it's made with Lõve, so thumbs up >:D
EDIT : Went back into it after a few days an yeah, the highway boss is definitely a cut above the previous ones... Throwing 3 bombs at start can't even get rid of half the 2 side units. Definitely requires training and a near-perfect knowledge of the stage, but it definitely looks possible >:D