Since I appear to have done it incorrectly on itch, the build files are here: https://drive.google.com/drive/folders/12ukN2FDyPAXobSw-Ld7mVNCX8WpuwlWY?usp=sha...
By the way, use asdw to move and pick up rocks. Aim with the arrow keys and space bar to throw the rocks. Don't expect too much, though. This is our first game. :)