You bring up a fair point with the mouse controls.
That control scheme was kind of a carry-over from some original prototyping I was doing at first and I just never questioned the controls.
With the current game it would totally be doable to swap with a key rather than a mouse click.
I was also intending for the digging mechanic to play a more central role in the game (which I thought may be better suited to the mouse).
But I found it was easier to design levels which utilized the world-swap mechanic moreso than the digging mechanic.
If I do end up adding more content and releasing the game I will definitely consider adjusting the controls.
Thanks for the feedback and good luck with the jam!