The sound design and textures are really nice. The two weapons pair together really well and are pretty intuitive. The progress bar was a little small and I didn't understand what it indicated at first, but it works well. The final boss was really difficult, honestly I couldn't defeat him after a couple tries. The phase where he copies himself and fills the screen with projectiles goes on for kind of a long time. Overall pretty great game, it's nice.
Check the gravestones if you haven't, there's some funny stuff on them.