How does one go about making a game like this? I had an idea for something similar, but I don't know the first thing about making a game. Is there a tutorial somewhere?
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Look at game engines first before anything. One I'd recommend is Godot as it's free and works well for 2d games.
As for code help, try to break everything down into as simple pieces as possible. For instance I would describe unupgraded interactions in time stop to be "Once the player has clicked on a point on the screen, start filling bar one at 2%/s and bar two at 4%/s" then if you can't figure out how to do that, look up tutorials on the game engine you are using.