Thank you for the bug report, Sorry for not replying right away, life got really hectic for me in the last few days. and i haven't been to a computer in the last few days. Either way Let me see the report.
For TFs not working...... yeah there is a major problem here... There are so many problems here. This is going to require a bit of investigation on my end as i can't even begin to see what the problem is. From the imediat spot check i can see that 2 functions are probably broken and maybe more than that.
You made a whole itch.io account just to give feedback? Honestly thank you so much! about spawn camping, it should be fairly easy to provide a bit of protection agents it. honestly i can just probably just delete every enemy.
I can promise you your sudden invulnerability is not intentional. Just some major problems with code, just something as you say is fundamentally broken.
As for norton, unfortunately there isn't much i can do about it. You should be able to whitelist the program in your antivirus . This is my one major problem with itch.io is that it doesn't do any virus scanning on files uploaded to it so windows doesn't trust any files downloaded from it (unlike steam) unless i get a publisher certificate, which is a bit too expressive for me to justify. So all i can ask is that you expose yourself to risk by trying to run my game and i promise that it isn't a virus.
Keeping multiple save files on your system should be pretty easy to do though designing the UI for it would be a bit annoying which is honestly the reason why i haven't done it yet, though it will be a thing in the future. As for upgrade toggles, that can be done and i might throw it in the hox fix that i have do.
Also about the waiting text being behind everything, i can quickly fix that.
Again thank you for the report! i can see you also posted suggestions in another forum and i'll respond to those right after i post this. I'll get to actually doing my job tomorrow and respond again once i nail down what the issues are.