The pebble placing was pretty buggy in the last build I could upload before the deadline, but I think I ended up fixing that gap bug and some other pebble placing bugs afterwards. I'll probably upload the fixed version sometime after the end of the jam. Being able to lock pebbles next to each other is intended, though. I do think I need to figure out a way to better incentivize not just stacking straight up though. Thanks for the feedback!