In general, the game reminds me of the old Hungarian classic, Perihelion. Of course, it was a cRPG, not an adventure game, but SARCO's bleak and bizarre atmosphere brings back the old memories.
The present version is very short, which may be the reason that I'm not able to find anything to criticise yet. I do agree that there's little interactivity and challenge in SACRO, but this is hardly a flaw, rather a conscious choice of the author, who openly admits that he wanted to focus on artwork and sound. And since he does it very well, there's no point in complaining about limited controls and lack of choices in the game.
The choice of player character deserves a special praise. Controlling a non-humanoid character, who can only communicate with body movement and doesn't have any limbs to interact with the surroundings, is an intriguing idea. One would think that it would be impossible to feel empathy with a mute, hovering drone, but my personal experience was that it really adds to the overall atmosphere by creating a feeling of helplessness and even subtle danger in an alien world.
I'm afraid that my comment will not be very helpful, since I didn't point out any bugs or glitches to be fixed, but I really hope that it will be an inspiration for your further work, with so many other positive comments below. Köszönöm!