Thanks, I really appreciate the feedback!
I hear you, I wish I had time to add some indicators or a tutorial, although there's some info on the potions in the game's itch description.
If you want to give the game a second shot, here's a longer description of the potions:
- [R] Teleports the selected tower to a random location
- [T] Disables the selected tower for the round
- [Y] Gives your units a speed boost in the selection area