Played your game tonight and enjoyed it!
MY ONLY COMPLAINT: Not a fan of how finding the base to upgrade is so challenging. Does it move around, as well? I tried killing enemies at the base and left a trail of coins... and when I followed them back... the base was gone. It would be nice if there was a small mini-map or even some sort of navigation that pointed you toward the base. Especially since you need to upgrade pretty quickly.
OVERALL FUN: It was a good time (with the exception of my complaint above), but I overall enjoyed it. The hoard does appear to expand quickly and get faster... so finding that base and upgrading seems important early on. Maybe it was just me, but I had a difficult time finding it to upgrade and keep up with the growing hoard. I may have been playing it wrong, too.
ART/GRAPHICS: Very well done here! Love the artwork of the ship, enemies and background images of space, plus the planets passing by, was all done nicely. Weapon fire and explosion animations looked great, as well.
CONTROLS/UI: The controls and movement, when I first read them, scared me. Some space/flying games with forward and reverse thrusters are challenging to control... but you pulled this off. They weren't challenging at all (which is good). Movement felt nice and fluid, and I love the reverse thrusters so I can still move and fire at the oncoming horde.
SOUND/MUSIC: Music was fitting and gave me that sense of dread. Kill this stuff quickly. Audio of the gun fire and explosions were nicely done, as well.