This was a neat concept, though it was a bit hard to control. I feel like there was a certain distance needed to really get it to spin properly, and I was never quite right at maintaining it. I did OK, and manged to make it to the end, though I attribute that to the throw ability which felt way overpowered compared to the other 2 options. Of course, I had trouble with the spinning, so this solved my issue, and someone batter at the spinning may have felt differently. I do acknowledge that aiming it does use the mouse, which means you start to move the way you are about to attack and need enough distance to not run into enemies before throwing. Still, I felt everything after getting it was much easier for having it.
The upgrades between levels felt good. The spin for random Legendary was nice, seeming to promise a potentially more powerful buff, but not getting to choose what.
Right before the cyclops fight I chose to spin for a Legendary. I got the one that said the axe head would block and destroy enemy projectiles. When I got into the fight and saw the projectiles, I thought the ability would be really useful, but it did not seem to be working. At no point in the rest of my playing did it seem to work on any projectiles. Later I tried again and got 50% of Max HP as Armor, and that did work.
After beating Medusa it went right to a credits type screen, with nothing saying you won. I would add You Won" or similar to the end screen, to make it clear to the player what just happened, as it was pretty sudden.