Not sure if you plan to work on that, but there is two things that came into my mind:
a) Display the side effects applied to a tower, caused by other towers (and in some smart way, which tower is causing it).
b) In addition to adding a tower between rounds, let the player ontop of that move a single tower, and/or re-shuffle the side effects of a tower.
But yea, if you are done with the game, np, it’s fun to play as-is for sure!