Is bastion a good game?

Is the combat system somewhat deep or is it more of a masher? Would i want to keep playing it just to fight things?

The combat isn't as amazing as the visuals/sound/story, but it is fun imho.
There are a lot of different weapons and a lot of different ways to upgrade those weapons(And upgrades can be changed to try out hundreds of different combos). So you could keep trying new things in combat.

I'm not sure if i would call it deep though.