I actually enjoyed some of the weirdness of the collision and the platforming mechanics; the character was perfectly fitting with the atmosphere, and the almost-weightless jumping (and movement while falling) made the platforming kind of unique as a sort of puzzle of its own. It's a basic platformer, so there's not very much you could do with it to make it radically new and unique, but it's memorable enough for how it feels.
The game looks great; every part of the aesthetic fits together great, from the character to the backgrounds to the music. There could be more variety, but other than that I don't have much of anything to complain about. Good job! It's a pretty game.
I like your use of the theme; the space-y atmosphere fulfilled a lot of the "Lightshow" theme for you, but the addition of the small radius light source around the player was a nice little addition to the theme - the light "shows" the stars you need to get. The way the bombs act is a fun little addition too.
I'm not sure if you tried to include the "Only One" theme, but I did think the fact that there is "Only One" main light source centered on the player character was at least a small step toward fulfilling that limitation in terms of the design, even though it wasn't really presented that way.
I enjoyed how the game felt and it would be fun to play more of this!