Game seems neat, but is very clunky to play at the moment
Some issues near the start. If you have a node that has a more nodes in it, sometimes clicking the node to remove it deletes all the nodes inside. You don't get them back to place again, which has led to me being unable to use my "b" variable outside of the initial setter. Not sure how exactly to get it to happen reliably, but it has ruined a few attempts.
The nodes you get at the end of a round all appear to be very limiting. For example, I don't see any of the repeat nodes implied by the game description. I get a lot of basic variables, and setters to directly set a variable to a value, which doesn't scale well. Perhaps reducing the number of variables you have access to early (I don't need 1 of every letter of the alphabet to start) so it's more likely usable nodes show up would be helpful.
UI around the nodes you have could also be improved, as it's hard to tell what I have access to with the jumble of nodes in no clear order.