buy the game, ask someone to gift it to you, idk pirate if you want, hakita wouldnt care (https://www.reddit.com/r/Ultrakill/comments/1d6hzrb/based_hakita/) just play the full game it is awesome, i somehow got over 200 hours already even though i got gifted it on steam like a month ago
even the demo somehow has a TON of replayability and it's fun as hell, so i think it's obvious that the full game is gonna be thrice if not quadruple as awesome. best difficulty to start with is obviously either standard or violent, but if you wanna play with lower difficulties it's also fine
ok sorry for the long and useless rant about how good the full game is i just wanted to say it