Cool tower defense concept! Lovely voxel art! Congrats on making all this for the jam. I couldn't get the pages to turn initially and gave up. I had to come here to the comments to finally figure out how to get it to turn.
For anyone else with trouble flipping the page, you need to point your left controller to the word "flip", and then press the grip to get it to turn. It won't turn with the trigger, nor will pointing to the page and pressing grip work.