Gameplay: Wonderful!!! I loved it! The movement was so nice (The mouse sensitivity might have been a bit too sensitive)! Killing the skeletons was extremely satisfying!
(I kind of did not know what to do after I defeated the first wave of enemies and got lost) 
Art: Instant Five Stars! -- It was BEAUTIFUL! -- Better than a lot of professional games! Great job and keep it up!
Audio: Spot on.
Theme: Yay, not another game that is not just a classic space game (Classic space games are good, but...)!
Devlog: I was too lazy to read it all, but Good job.
I just added your game to the text file that I store all my favorite to least favorite games in, and yours came on top as being the twentieth game I have played.