Strong implementation of the theme story-wise and also mechanically... ( I did not trust the game pressing 300 keys).
One little hint considering the control schemes, this is probably niche, but I'd advise against using the Z-Key when no input-remapping is allowed and you only got few input actions you need. Reason: There are qwertz and qwerty keyboard layouts are pretty common, and for one group your input description is wrong. It's simple enough to find out, if you know, but you can easily dodge that hiccup.
Overall nice job.