There's an option you can frob in Putty for Backspace. It can either send control-? (127) or control-H. Try the reverse of what you have now and see if it makes the H3C stuff happy. FWIW, H3C is ...

Putty Squad follows the story of unlikely hero Putty in an old-school platform-adventuring quest for his kidnapped friends. Throughout the game Putty will be able to upgrade his attacks, which range ...

It's very puzzling to me how the same key that works in Putty is not working in Terminal. I'd also be happy to try another program if a free one is available for Mac.