If the controls were more intuitive, you wouldn't need instructions on how to interact with your environment. Unfortunately, there aren't really any instructions. It's certainly brain-wracking, as you try to figure out what you're supposed to do. Frustrating is another word. Fun? Not so much.
This is a seriously disorienting game. The instructions are so rudimentary as to be useless, and the learning curve isn't matched at all by the in-game help. I've accepted missions to go kill "rogues" but there isn't an obvious way to do that. Also, every time I go into battle, I die within a few seconds. The response rate of my "hero" seems ridiculously low. Guessing from the rating this game has gotten in general, I'm probably missing something, but for now, it seems this is just a shitty game by today's standards.
"Mouse to fire" is uninformative. If I can't figure it out in 30 seconds, and nothing pops up on screen to help, you've failed as a developer, no matter how much fun the rest of the game is. Rated 1 star.