Since you're planning to sell this on Steam, I'm gonna go more in-depth than I would normally.
Presentation is absolutely on point. The music, the bombastic announcer, and even the subtle bee noises are great. The gameplay is tight, and some of the upgrades are quite fun! There are some balance issues, of course, but this game nails that addictive factor that Vampire Survivor has.
My biggest issue with this game by far is the equipment system. I get the logic. You want players to choose between getting an upgrade for the current run or selling the loot to buy permanent upgrades for future runs. The other, much more obvious side of the coin is that this system makes the player choose between passing up on gold for upgrades, meaning more grinding in the future, and losing out on an upgrade for the run. It just feels awful.
Beyond any praise or criticism, I want to end this with a question: Why should I play this game over Vampire Survivor, or any of the other clones on Steam? What does this game bring to the table? If you want my take, while it isn't shown in this demo, I gather there are gonna be a bunch of alternate game modes like area control and missions that shake up the standard formula. I don't think there are any other VS clones that have something like that.