I really appreciate that you took the time to comment and play the game. There is a way to get the save file from the browser version to the downloaded version. Jump into our discord here and in the general chat there's a topic about Heroes of Everfall detailing the steps to transfer over the saves. Just note that currently only drone upgrades are saved but I'll be looking into saving drone counts as well. Energy costs and drone behavior are also something I'll look to address and improve in a future update.