Quite ambitious! There is really a surprising variety of environments in this game, with a lot of 3d environments that actually feel quite different from each other. You do end up navigating each level a bit differently and they indeed feel like very different locations.
I know that with Game Jam constraints balance is pretty tough to maintain, but I do think that more enemy variety and balancing can help a lot. Since there are only melee enemies, ranged skills are very powerful. With a few upgrades I did not end up using my melee attack much. You can also defeat a lot of enemies outside of their aggro range, maybe making them aggro onto you if you hit them would quickly make the levels more challenging.
I think there is a lot of demand for a 3d hololive adventure game.