Got to play this!
Your interpretation of the theme is actually genius! Using shadow as a verb was so creative! really helps stand out from the crowd of games with the word "light" or "umbral" in their title (which I would never do).
The controls were quite good, even in this short little demo i was able to get a full grasp of them. in a future release, make sure to have it check for a collision below the player when calculating gravity instead of a collision in general to prevent getting stuck on walls (at least that's my guess as to why that happens)
For what it is, this is great. I could definitely see this as something more if life didn't get in the way. you should for sure feel proud of what you were able to accomplish and continue in the hobby!
Thanks for the experience!