Oh damn! Sounds weird and hard to track down. If you do happen to encounter it again, please give me as much info as possible. Screenshot of the frozen state would be helpful too as even the skills might play a role here. I’ve played the game a lot for the past month or so and haven’t seen anything like that so it might even be something that happens as the game gets further along, you seem to be better at it than me. I’ve only broken the 1 mil barrier once.😅 Pretty sure it will happen in all versions though.
Now that I think about it a bit more, I’m pretty sure it is skill (pool) related as you saw the level up text. At that point the enemies do stop and your swapping is locked too. For some reason the game couldn’t come up with a set of skills to present to you and hence it freezes there. Hopefully I can track it down and get it solved. 🤞