Thanks for playing! Some rooms do require a bit of enemy baiting to get them to narrow corridors or to exploit slowness of certain enemies. I can get to the third level pretty consistently, and there some rooms might better be walked around when possible... Each level should have a pre-determined amount of each room type.
I think weapons can only be found from level two onwards (there is a specific room that spawns a few, and some enemy type can drop one) - perhaps it would have been more fun to start already from level one, but I didn't have time to implement fancy escalating loot curves or ammo management, leaving the weapon stuff perhaps a bit underwhelming...