Dear Vellidragon.
First I want to thank you for taking the time to try out my game.
Yes, you are right about the game not being clear about what to do when start playing. I'm planning to release it on mobile platforms with these changes in mind.
It looks to me that at some point you upgraded auto-fire bonus time and that is one of the strategies to play. In this case, you can focus more on the thief and collecting flying bonuses.
By default, if you leave auto-fire bonus time last to upgrade you will always need to fire the cannon yourself.
Thank you very much for these nice observation points I appreciate it.
Thank you, Thank you :D