the game is really like a clone of vampire survivors, so I don't give it much credit in the originality of it. Actually, this isn't the first game in this jam that tries to mimic vampire survivors, maybe everyone just want to do that when they read the jam's theme. The game could use a title screen though, it's surprising to me when the game started, and I just got shot.
I know the game's instruction on the web says that the button to open the upgrade menu is spacebar, but it'd be nice if you add something like an exp bar or something that shows me I have enough points to upgrade. I don't know how big the enemy's health is but even though I upgraded the shot power (the middle upgrade), it's still hard to shoot the enemy down, or maybe it's just me.
I like the shake effect when we got shot though, it gives a good feedback.