A simple concept, but well executed. Took me three tries to win the game, so it seems well balanced. I like the forging sound and those falling star particles when you get a new kind of sword. Also the disc and most of the swords are visually appealing.
The disc seems to be a little off sometimes. Once the arrow stopped slightly on the red bar at the top right but it still counted as green. It's missing some more sound effects, like a "drop coin in the bag" sound for example.
Since you took longer than 9 hours, I reduced my rating a bit.