Hover over the aliens (or click if autoclick is turned off) to earn resources and XP.
Every level will grant you a Research Point that you can use to buy Researches.
Plan carefully what researches are you going to buy. At what point you buy them may have a big impact on your income.
Percentage based researches will autoupdate but multipliers will multiply your current number affected by sequences and more. Research wisely!
You can export/import your game in the menu. In case of wipe there’s a copy of the export in a cookie called cookieSTE that updates every hour.