Something to make the "pick 2" mechanic more clear that it's part of the dungeon's timeline would help clarify things I think. I kind of imagined it off a similar addition to the UI in level that could be added to enemies coming in to the timeline, a slight offset as they move to their slot in the timeline. I would want to see more of the timeline too (even just one more slot cause I like the subtle fade in as the last slot fills in and it almost feels like a fourth slot with how you can picture the counter going down in your head).
Anyways, I really love the game and think it has a ton of potential. The audio was spot on, only noticed it when I went to rate it because it fit the vibes and the mechanics perfectly.