When Android emulation is too good. 
but the percentages for CPU are all rubbish (like 9616%, 2308%, etc
I have the same problem with Crest since either 4.x or since the Crest fork.
It also no longer shows Android processes except for com.jolla.home.
I don’t have mad battery burn though.
You can surely just wipe the Dalvik partition. You would need to back up what data you can. I think the process is to uninstall all Android apps and then uninstall Dalvik but there are many people here who understand this all way better than me.
I checked out https://game.cyeep.com/ in Opera for Windows and it didn’t complain about anything. It has cryptomining protection and I think some malware protection built-in.