This is a DOOM-Like game for people like me with older phones like my 5S. Video happen when you fie and sometimes when you complete a level, like many free mobile shooters. Firstly, this is really impressive for something probably only programmed by one person. The mechanics function, although I would like to customize button size and position. The MIDI-like rock soundtrack is incredible and varied and just what a 90s PC shooter fan would expect to hear. The dungeon game feels very samey all the way until level 7 when they start introducing new enemies, weapons, and rooms to the dungeon. The levels are procedurally generated, meaning there is potential for endless variety, but it can also yield unexpected or boring results at times. Also, there is the slight annoyance that if you watch an ad to "try again" when you die, you just get 100% health on the same screen where enemies killed you, and they are still gunning for you in an instant. It would have made more sense to restart in the last room, at the beginning of the level, or with a period of invincibility. All in all, as a gamer growing up in the pioneering days of 3D shooters in the 90s, I feel at home here, and if played in short bursts, the way mobile games are intended, it's a lot of fun.