Nice simple fun ! I like the fact that your title screen doubles as a mini tutorial where you can move around and test out the ship's movement and charge mechanic so that you can understand well how everything works before jumping in.
The charge mechanic itself is a pretty good take on the theme, and its cool that you don't have to get stuck untill full charge and can just go for small increments dodge repeat untill firing everything
i found also neat that you had some enemies give back some shield sometimes
i didn't find much issues with this one so i don't know what more i could add
well done :)