Great concept! Took me a few rounds to fully get the hang of it and find my rhythm. Congrats on finishing the project!

This is SUCH a cool concept done well. Took me a few attempts to really get my fingers understanding what the colors meant, and when the enemies started doubling back was a genuine surprise! 

Score 3200, and I'll be coming back to this. I only just got to when "picture" is a factor, and I need to get my fingers to understand *press space*!

Really well done.

Excellent gameplay concept executed well. Room to expand with such a solid base.

YAYS :

• The next level up with the more complicated waves was an awesome touch that was needed.
• The Art suits the low res.
• Common sound effects are sharp but not annoying / Music is a nice ambience that fits the theme. 
• Moving background was subtle but made the screen interesting. It did not fight against the harsh red/blue enemies though, so it added to the appeal.
• Anchoring with SPACE was a neat trick but personally i found myself not using it. May be more useful on bigger maps.

NAYS :

• Although avoiding the red was intuitive, it was not so obvious to need to hit the blue. I did realise after a few plays, and you did have it in the [?] menu so that's on me for not reading :P I feel like there could be a more obvious way to portray it / integrate that obvious link with the graphics you already have.
• I loved playing over and over but dreaded having to use the mouse when i was just using keyboard so precisely. Add menu navigation with keys?

Thoughts : 

I'd love to see bigger grids in future too / weird shapes (eg diamond) to also explore this!

Interesting! I'm dumb so it took sometime to understand the game, but then I got addicted to it. Nice work!