Really great art on the UI, map, and characters. I also love the level design where you need to utilize your character ability and platformer skills a bit.
I think the movement can be improve, jumping feels a bit odd to me where the velocity ramp like a jetpack. I also don't like the dark stage, where it's too dark to react to anything. it requires you to try and try again instead of adapting to the situation on the fly which is more fun.
Boss fight is engaging, i love how it have high hp to make it intense by avoiding mistakes which increases during fight perfectly. Also nice touch on the storyline!