Pretty good.
The art could definitely use some work, but it isn't a bad style. The music is way too repetitive and irritates after a while.
My main issue is the bats. I think it could have been telegraphed better that you can't attack them or fight them. It was kind of frustrating trying to figure that out.
Some of the platforms looked like you could jump to them when you couldn't. Making it more obvious when an area isn't accessible from where you currently are would go a long way to make this game feel better.
Overall, keep up the good work. Hope to see more from you in the future