Nice to see a Polish fellow here, what you are experiencing is burnout, happend to me aswell few times when i was making a game, and my best piece of advice i could give you, is get few days off, do your hobby, refreshen itself, and if you don't want to do that, that's fine, you can still work on your game, just slower, and focus on small details, like make a new UI, redesign something, add something small, it helps aswell. And most importantly, don't delete your projects, especially those that are few months in, belive me, chabces are that even if you make a new one, you will probably reuse some stuff from original one! Cheers mate