Loot the train as an awesome game! I'm thinking they should make a more awesome sequel with a better variety of weapons,turrets, etc. It should be a bit less boring (not that it's that boring) by adding more features as you progress such as: lazers, sheilds, power-ups, spells, special armor, minions, etc.
If you agree or wanna make suggestions, please leave it in the comments below. Thank you.