I've written a small game about fitting a block through a gap. The smaller the gap the better the score. Left/right buttons move the left paddle in that direction and the right in the opposite direction. The Z button drops the block and you can also use the X button to pause the game but I might remove this. The block reduces in size each time you are successful and the game speeds up once you get through all size of block.
I'd like to add menus, a level select with how well you've done in each level and maybe some music.
I've also now ported this to iOS: https://apps.apple.com/tt/app/perfect-fit-block-drop/id6449626297 and Android: https://play.google.com/store/apps/details?id=com.anefiox.PerfectFitBlockDrop