It is not necessarily a very good game but the concept of stacking up enemy corpses to climb to the next screen is a fascinating one. Here's a video of someone slogging their way all the way through it: https://www.youtube.com/watch?v=Rmt4mdyIEuE
This one had all kind of weird mechanics. You die if you touch the green spikes (living the gray corpse) and have to press the button in the middle to continue:
https://youtu.be/IWdz-tZyJUI?t=410
This one had all kind of weird mechanics. You die if you touch the green spikes (living the gray corpse) and have to press the button in the middle to continue: https://youtu.be/IWdz-tZyJUI?t=410
And the sequel had superpositions: https://youtu.be/JXLEwDNRp2k?t=232