The game mixes elements of Souls (stamina management), Diablo (procedurally generated loot drops), all mixed in a tiny and cute twin-stick shooter roguelike with retro feeling.
The game ISN'T a bullet hell, nor it's going to task your reflexes. It's more about risk/reward and just keeping up with the best loot drops. There are basic categories of these items and besides guns, all they do is to have higher numbers. SOME items might be super-duper rare and act a little bit different from the other rarities of said item, like shooting three times in a row at random directions, but nothing crazy.
The graphics are really cute (just disable camera shake as it's one of the most vomit-inducing ones I've ever seen), the music is nice, and the gameplay is fine... the thing is that the game doesn't have a very long-lasting power unless you really enjoy the shooting, which again, it's just okay.
It's so easy to win runs, and there's nothing to unlock between them. Once you finish a run, you're offered to go back to the main menu, or go for a New Game +. It has multiplayer, and three difficulty levels, but I just wish there was more to it. It's addicting to manage your mech and your build, and the overall package is good, but it dries out of content really quick and while other guns are satisfying to use, there are these MOAB bombs that have a huge splash area and damage. I won the game firing beforehand and just entering rooms to pick up loot basically without ever need to heal in between levels.