Cool idea, creative approach to the theme!
Gameplay: The gameplay reminded me a bit of okami. The thing is- in Okami, when you painted the shapes the game slowed down, so you could be precise. Here, the pace stays the same, and since you need to pretty precise to draw more complex shapes... I just ended up spamming pillar and the fist. It wasn't called the fist, but I forgot how it was called. You get the idea :) I'd prefer slower gameplay, where I could have an opportunity to be more deliberate in choosing my moves.
Audio + graphics: decent pixel art! The enemies had a bit of Castlevania vibe. The backgrounds could be more varied. Also- you spend most of the time looking at the top of the screen, so you don't get much chance to appreciate the enemies.
Theme: Very cool take on the theme. You took "stargazing" and build a combat mechanic on top of that, that doesn't feel "tacked on".
Over all- Some design decisions didn't land for me, but the original take elevates the game as a whole. Keep it up!