This is a really cool idea and I love the skeleton animation!
If I might offer some feedback- I think it would really benefit from adding more of a class feel to the different characters; as an example one character might not have an attack but have a big shield and a lot more health, one character might slow enemies that they are facing, and adding some variety to the enemies in terms of either damage, speed, or ranged attacks would go a long way.
There's a shell of a really sweet game here, great job!