The title says everything, is there any backup or something else to restore my game or I lost it forever?
Correct, because the geniuses who maintained this product never properly QA'ed it. Use a real product that is tested and tried.
nobody wants to lose all their work and efforts over something that has never been addressed.
Congrats on necroing a thread from almost 2 years ago. i find it amusing that you bring up a problem from that long ago in addition to arguing that the project hasn't "progressed". If you're looking at the past, you will see no progress from the present, as that occurred before the present came to exist.
I think you'll find this issue
1) isn't relevant any more.
2) is fixed and won't occur again.
In adition, don't complain about QA on an open source project; these projects are maintained by the community and you should always expect bugs on the latest version released. This is because they're rolling releases, and updated every time the source code is changed. That's just how the computer world works. This is why you always must save backups. We all forget to, i lost a ton of college work because word corrupted it, and i had to re-do some work that took me 2 weeks, within 3 days. it's life.
Kindest regards, and best of luck making your own immensely powerful IDE.