Wow. I loved everything: gameplay, graphics, music, story, level design, UI. Extremely well done!
I played through all levels and there was a good progression in terms of difficulty / understanding the mechanics (especially around the laser detectors).
I'm looking forward to it being developed as a full commercial game, I'll definitely buy it on a day 1 :)
And thanks for the great MIT licensed Godot project! Do you plan to keep it around as open source even while you work on a full game? (That'd be great :))