Is Floria's Venus Kiss ability bugged, or is the tooltip inaccurate? It says that using it on an enemy affected by Aphrodisiac will reset its cooldown, but that doesn't happen. If it worked as described, Floria would be a very effective combatant. She could hit multiple enemies with Lust Mist, then hit each of them again with Venus Kiss, as she'd regain the spent energy, and reset the cooldown after each use. Without the cooldown reset, it's pretty underwhelming, especially since she only has 2 moves, so regaining energy is kind of pointless.
You have to use the steamclient_loader.exe file to start the game. It's noted on the FP.