Heya! Finally got around to your game after requesting feedback on stream - if concept is worth working on it more?
I think its entirely on how much you think you can take the idea in new and interesting ways. The inspiration to Vampire survivors is obvious, but given the restraints of a Game jam, its missing some of the hooks - Permanent unlocks between levels, direct item interaction and combinations that let you break the item rules, way too many unlockable characters that each have their own level-ups and level pass-trackers on a range of maps that are better and worse per character - Just so so so many reasons to keep coming back.
But the other thing is you need to work out how to still be a step different than vampire survivors - the timing and sequence idea is cool, but vampire survivors is kinda already on this system with its internal, hands-off cooldowns. Maybe the way the world or character moves can also be a part of this sequence? Lean into this idea more, simplification is better here
That said, this game is a stunning work of art for the gamejam time given - don't let this feedback take away from the incredible idea, artwork, music and execution - Legitimately impressive and you guys should be proud!