The base idea is pretty fun, I like what you have going on here. The upgrade system also adds alot to the replayability. Appreciate the saving of progress on my coins and upgrades as well!
A few things I'd like to point out though:
- I think pause is broken. The first ESC press pauses the game, but the menu doesn't show. So subsequent pause/unpause is flipped (pause menu shows up when unpaused, pause menu hides when paused)
- Kinda wish there's a little more "hololive" going on. One way is maybe to have a bar of each holomembers that fills up when you defeat their respective counterpart, then just unlocks and shows a screenshot of their memory together when it fills up completely or something along that line