I'm considering making a 2D game for the PC. Here are the specs for my laptop:

OS: Windows 10

Processor: Intel i5

GPU: intel Graphics 620

RAM: 8 GB

I'd be the only one working on this game so my scope for testing is limited. Can someone suggest a minimum list of PC configurations I should consider testing the game on to ensure a wide audience has a similar gaming experience?

What kind of game? What tools?

2D games in the browser you'll want to test on plenty of browsers and systems.

2D games using Unity or Unreal you won't need much if you stick with built-in tech. If you build custom shaders you'll want additional graphics cards, if you build other custom systems you'll want to test those.

2D games using a MonoGame or GameMaker:Studio or Construct, probably the same as the big engines. Test what you customize, don't worry about built-ins.

2D games built from scratch you will want to try several systems, particularly anything focusing on specific hardware.