Hey,
thanks for your elaborate feedback. I know the game was hard but you are the first to tell me that it is SO hard :D It actually is supposed to be like that but I think I need to make it a bit more beginner friendy so that first upgrades come sooner and the gameplay loop feels more rewarding.
I'll also check what is wrong with that technical issue you had with window/fullscreen.
Yo feedback is extremely valuable to me, so thanks a lot! Please send me the link to your video :)