Softlock...

[Boshyko]

Guys i found Softlock... After you bit Giant mecha boss in mining dungeon, you get blue ice shade (to get tier 2 skills) and if you upgrade this skill (and then click "show tutorial") while riding on elevator you will eventially stuck... Only alt+F4 will save the day (nothing else works)

p.s I added some screenshots on my profile
Sorry for grammar:)