Boulderdash 128 by Pyrofer (2016) - Here is an excellent example of a Commodore 128 action game in 80 column mode.  It didn't work in VICE for me, but some say it does.  I used Z64K and it worked great.

Here's ia thread on the Lemon64 Forum where you can find some more detail.

Also, here is a link to a really interesting interview with the creator of the original Boulderdash.

Note - This program is also known as Rockfall 128.