Love how self-explanatory it is. Very impressive for two days of work. An (automatic) level-reset or undo option is no luxury because there are many ways to lose the game. The puzzles get quite difficult in the end, which is cool.
Edit: only now saw in one of your comments that “You can actually restart the level by clicking on the circular arrow in the level.”. Didn’t realize! A text pointing out what button to press or click after you died would be one solution.