as a player who's crushed super hexagon, i think it's a very interesting game and it has potential. the shape being hard to control definitely adds to the frustration, which i think you nailed it. so far, my best is 17, but i think that's due to luck.
i'd like to suggest a few things:
first, i think the song should stop playing when you die. it's to really tell the player that the game is indeed over.
second, i think the amount of sides in the background should match the shape.
it's a small detail, and i fear that it may make it look like a super hexagon ripoff, but it's up to you if you if you want to add these suggestions.
i look forward to what you do with infinigon in the future!