Cool game - loved the pixel art and music! Movement is a bit slow I feel, I know it'd make it really hard with arrows travelling faster but I think everything should speed up a few notches ;)
Was a cool hybrid of a bullet hell and a VS/Gauntlet style slash 'em up - will be really cool if you add bonuses, level ups and basically extend the time each time you survive - like start on 30 seconds, then increase by 30 secs every level or something, make it fast and furious and juicy and I think it'll be a really cool game. Also, I really like the choice to make it an isometric plain instead of just top down - nice touch ;)
Great work in such a short time!