Interesting mechanic! My only observation is that the Grid for the tilemap seams to be a bit bigger than the tiles or there is something with the textures that leave some yellow lines between them. other from that was a solid game with a cool mechanic for the gameplay tho I was a bit hard for me I also was fun and challenging.
Viewing post in A lonely rocks journey jam comments
You can create a sprite atlas in unity to fix that. http://https//www.youtube.com/watch?v=1w5VEgXBo4E&t=628s in this video at min 6 they show how to use them.