I really like the idea,
But the platforming feels so unresponsive, it ignores my jumps most of the time,
the first level was a bit too annoying as you have to sit through the unskippable cutscene every time you die.
The space/shift to switch words is really nice, and not moving while doing it makes sense from a balance standpoint, you have to choose between moving and seeing obstacles. And later on, you introduce the sprite mask that makes it playable.
I think with some minor tweaks and polish this would be a nice game
good job!