Very well done! There were so many little touches that made such a simple concept really compelling, like slowing the player down as their number increases or making enemies you are too weak to defeat glow red. The attention to detail was wonderful, and the controls handled quite well (a necessity for something that asks the player to maneuver so precisely). Overall, you have an absolutely delightful game here!
P.S., top score after a handful of tries was 281, I'll be back to see if I can improve....