As a possible little bug, it seems like when I die I keep whatever health potions I was holding, instead of resetting to the potions I began the level with?
Also, it looks like the source repository is private or gone? I don't have any plans for it, just noting the dead link.
I had a weird time getting started on this game because the page layout cut off the rightmost three columns of tiles. Adjusting for a wider window made it work better.