TLDR - Good, but somewhat rough. 3/5
Graphics:
Well done for two people during a Game Jam. The appearance of the boss can get repetitive after some time, but the randomness and mixing of abilities gets a bit of variety. Overall, the graphics are decent.
Music:
Well done. No major issues or problems I could hear.
Gameplay:
The gameplay is rough. I haven't found a way to fast forward the boss intro, which gets real repetitive after the first couple of times. While the point and click is a decent idea, it comes off as a bit awkward. The inability to hold and either charge up a large attack or attack continuously seriously inhibits combat. It makes gameplay clunky when combined with the jumping. Now the main gimmick of the game, the wheel, is well done. That part truly shines through. A save system or way to use the gold collected would be quite beneficial to the gameplay loop. Something like a Vampire Survivors stat upgrade system would be quite complementary to the gameplay or some kind of temporary power-up. (For example, extra health or damage for the next boss in exchange for some gold. Heck, even a one time revive would work well.) Some kind of additional way to increase difficulty would also be nice. Some kind of 'curse' mechanic that makes the battle tougher (more bosses or making the boss do more damage/have more health, etc.) would also add some additional challenge for players after a bit of gameplay.
But don't let my suggestions/critiques take away from the praise. This game is genuinely good and I think it has some real potential if you want to continue developing this. I recognize that I'm a random person on the internet, but I would pay for a complete version of this on Steam. I don't know if you plan to keep working on this, but I sincerely hope that you will. I want to see what this would become with longer than a week of development.