Thanks for playing! :)
Yup, the game is really just a proof of concept and isn't very fun, especially since it doesn't have any containers like you mentioned. But the crash is new to me. Could you elaborate?
I'm not quite sure because it has happened with both the gravel and the stone, but eventually after I use up a couple items and keep playing, I get an error message in my browser if I pick something up, don't know what really triggers, maybe an out of bounds error in an array, usually happened when I had at least more than 1 slot available. Perhaps it could also be an item trying to assign itself to multiple slots. ยฏ\_(ใ)_/ยฏ