I mentioned the CPU usage as one of the things that happened, but it wasn't the game slowly ramping up over time and using more CPU until it overwhelmed my system. I'm playing on desktop with my dev system, which is decently powerful. This was a case of something happening in the game and causing it to quickly spike CPU usage and then lock up. It stuttered for a bit like it was trying to recover, but after several minutes of high CPU usage it was still not responding. My browser still responded, including scrolling the page the game was embedded in. The issue happened shortly after starting a new level, with a bunch of boss enemies and a laser hitting them. I also had just started to click over them. Things got laggy, then locked up. One of our kids has played and also got a lock up. They commented on getting a lot of crits when theirs locked up. Theirs only had one boss on screen, but there was a cluster of enemies they were attacking and getting the crits on.
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Sorry that i deleated your latest reply but i missclicked... Most likely the problem is dealing a critical hit to several shapes at once, which is why the game freezes due to loop. Yes, it's a bug and I'll try to fix it as soon as possible. The only solution I see for now is not to upgrade the critic chance.