Oldest one I boot up regularly is Super Mario World I would say. On a less frequent occasion I do also play Tecmo’s Deception (PS1). I do like going back to Gradius for the SNES as well.
Contra and Contra 2 are fun, but very challenging games I will occasionally bust out.
PC gaming wise I have been playing City of Heroes and Diablo 1.
Check out antiperspirant for your feet. The issue might be related to your feet sweating and creating dampness in your shoe your whole shift. Also ideally have two pairs of shoes to alternate for work.