Pretty much the only modern game even trying to replicate the execellence of Tyrian or Raptor. A recent patch (28 April 2015) addressed the early game slog by having the player start with a second weapon slot so there is at least a semblance of customization at the beginning.
-actual hp bar so the game plays more like a shooter than a mouse avoider
-online co-op multiplayer
-waits way too long to actually unlock the 5 weapon slots and a good selection of weapons (it gets good, but still)
-Tyrian is 10x better, if you haven't already played Tyrian so many times that you just can't play it any more go get it instead
If you long for a Tyrian or Raptor styled game and have played out the old classics, get this.