There's a browser based version of Oregon Trail I've played a fair amount of

the Vex series are pretty good parkour/platformers that even had their own level builder

red ball

one fun one was the helicopter one where you move blocks into positions that I forget the name of

I forget the exact name of the series, it's Flight or I Can Fly or something like that. The one with the penguin where you upgrade your glider and try to destroy an iceberg

A pretty good one with a rocket you upgrade and eventually get to Mars that's fun

Sorry I forget the names, it's been a while. Most probably aren't even playable anymore unfortunately