Unless there's some other way of gaining extra stat points, it'd take an excessive amount of farming to tier up, since the cost of doing so would be 32600 SP. That'd require level ~500 with the maximum stat point boost from rebirth points, and that's just for a single tier. Seems a bit unachievable right now.
I'm still getting an issue where every time I open the game it deletes my progress. Still coming back though because the updates seem to be coming pretty regularly
I do not understand the use for weapons. I probably have a trillion by now, and yet there is nothing that I've figured out to do with them. Is there any use for the weapons?
I believe that the offline feature gives approximately 50% of current earnings. Do with this information what you will. I would be happy if the Dev(s) would increase that to the normal cash output but if the 50% was intentional then whatever.
 "Defender Idle 2"){kind=icon}
 "BrainCreator"){kind=icon}
 "Geometry Idle"){kind=icon}
 "Artist Idle"){kind=icon}
 "Click It!"){kind=icon}
 "NGU IDLE"){kind=icon}
 "Learn to Fly 3"){kind=icon}
 "Tangerine Tycoon"){kind=icon}
 "The Enchanted Cave 2"){kind=icon}
 "Idle Recruit"){kind=icon}
 "MINE reloaded"){kind=icon}
 "Idling to Rule the Gods"){kind=icon}
 "Clicker Heroes"){kind=icon}
 "Idle Village"){kind=icon}
Are you playing on Chrome? If not I would advise to do so as at the current state of the game it only seems to be working fine on Chrome.