an obvious answer would be godot. anyway, unrelated:
1. please don't make ai-generated asset packs without clearly disclosing the fact that they are ai-generated. while you came up with the idea, you did not make the actual asset, so it's like taking other people's work and then claiming it as your own, which is an action which i need not explain the immorality of. especially since generative AI "generates" images by doing a bunch of fancy statistical analysis between your prompt and a training database of millions of images and artwork stolen from the internet without permission.
2. don't submit asset packs to game jams. that is clearly not a game.