I played the latest 0.9 version.
I really like the idea and admire the audacity to take on a physics based Jenga game. It's a tough challenge.
The outcome is very janky. Perhaps that's the intention? Play is obviously very tricky.
The difficulty is very high right from the start. You could let the player start with a simpler tower and work up to increasingly larger ones.
Selecting blocks needs a little work. It's often not clear which blocks have been selected. You think you're removing just the central one, but a neighbouring block is also removed despite the direction being clear. The small black outline isn't enough.
One game play issue, is that although there are different types of blocks, you can only safely remove the ones at the top. So, you don't really feel like you have much of a choice.
Really could do with some music too. And some optimisation, the load is really high.