Original, and it's creepy. The radio and stealthy military stuff gives me a metal gear solid vibe.
It feels like it's in the realm of a puzzle game, so can you complete the levels without taking any damage? I might have just not been catching on with the best way to use stairs and the other world, but I felt like i got a little lucky each time I won a stage and usually had 1 hit point left.
I really dig the vibe, and I like the mechanics. Very cool, especially for a first game in godot!