Really really fun. People say it's difficult, but the only thing you need to worry about is dodge rolling. quite hard on floors 3+ and bosses are challenging. I don't recommend for people who hate starting over, since when u die you go back to the very start. However, u can unlock elevators, mercenaries, and new characters, but require a lot of progress. the best thing about the thing is the guns. everything is related to guns, whether its punny names or just guns shooting guns. there is a huge array of different guns, but you must obtain them every time you start a new run.