This is OrangePixel best game, second is Meganoid... really grateful to have a developer like this on this forum and on iOS. My GOTY if the poll ever shows up.
Yeah it was a tough choice for me between this and Momonga, I think Gunsluggs just edges it. I have a slight complaint though, sometimes when you start the Donkey Kong-like mini game you get killed by a fireball before you've even had a chance to move. That's no fair.
While you're at it, you could start the character in the train game a bit more to the center of the screen - the first time you play it it takes literally 1 second before you lose and then understand that crossing the left border means game over. It might even be the case that you're already being flown to the left while landing, making it even more abrupt, can't recall. Also, try to avoid having a crate in the first train car Minor complaints from a "first user" perspective - or, at least, show a hint message saying "Don't fall from the moving train!". Now I always know what I'm up for, though. Cheers!
Awesome game, I think I like this better than Storm The Train (which I loved), tho it's too early to tell. I died at all the minigames before I knew what was going on tho, so can't comment about them.
Just to let everyone know the soundtrack is now available on iTunes here: https://itunes.apple.com/album/gunslugs-ep/id595810018