1. The tools don't actually have hit detection but rather the controller holding the tool is being detected. So, even if you swing the tool, if your controller is not in contact with the block, nothing happens.
2. The avatar seems to be about 2 blocks tall. So, if you mine only the top block of the side of a wall, you can move forward without mining the leg height blocks. You go over the leg height block into something like a crotch but then, when moving forward, lower body is clipping through the leg height blocks. All ends up weird with half of your body phasing through blocks.
3. The jogging only is triggered when, after the headset goes up above the starting height by 2 inches or so, the headset goes down to the starting height. Why not trigger motion going up and down both ways? and reduce the detection height to 1 inch. Side note, nothing for going below the starting height and up.
4. You need to at least instruct the players better on how to place blocks. fling the controller holding the block 3 ~4 times in the same location is not easy to understand at first. Personally, I don't get why there is a need to include mini-blocks floating in the air. Why not let them drop in place in unfinished mode? You can make a hammer to hit the blocks to finish them up.