Hi! Thanks for feedback.
First, in the How To Play IS all the information that can you need to play.
This the theme: (which is explained in How to Play) It is a roguelike but the improvements have a chance of GOING BAD, of having bad luck. That's why the topic SOMETHING COULD GO WRONG continues.
Third. When you kill all the enemies (the round finished) there is a text: GO TO THE SHOP IN THE MIDDLE OF THE MAP. In the shop you can buy the improvements and to close the shop you have to pressio "E"
I completely understand your criticism and in my game there are many errors but I think that what you are complaining about that there is bit information, is well explained in the game. I ask you please if you could try the game again (and then rate again), taking into account everything I told you, and then you can enjoy the improvements in the store and you can better see how the game follows the theme.
Thanks