if you press escape for anything in the game it minimises the screen every time, and at the start you need to maximise the screen to get the start etc buttons to work !
Viewing post in 99 Waves [Demo] (Action Platformer Roguelite) comments
Thank you so much for finding the problem! As you said, ESC minimizes the screen so currently I recommend you download this game or play with non-fullscreen mode. When buttons not pressed, please try turning on and off fullscreen.
Sorry for the inconvenience and thanks for your play! We will update to the version with this issue fixed soon!