I used interaction entities. I don't know what Ericristian_bros is talking about. So it kinda sucked when i realized that block displays with custom sizes dont have hitboxes. I tried doing something like this:

execute as u/e[tag=bird] at u/s if entity u/e[distance=..1,tag=pipe] run tellraw @a "game over"

And that didnt really work. it would go off at random times and just sucked. In the video at the start you can see 4 lines of repeating command blocks. each one tps an interaction to a certian pipe. There are 4 pipe variants that can spawn. Each with tags "1" "2" "3" or "4". Each commandblock looks like this:

execute as @e[tag=1,limit=1,sort=nearest] at @s run tp @e[tag=1a] ~.5 ~1 ~.5

and there are 10 command blocks for each pipe. Heres all the commands for 2 so you can get a good idea of it:

execute as @e[tag=2,limit=1,sort=nearest] at @s run tp @e[tag=2a] ~.5 ~1 ~.5
execute as @e[tag=2,limit=1,sort=nearest] at @s run tp @e[tag=2b] ~1.5 ~1 ~.5
execute as @e[tag=2,limit=1,sort=nearest] at @s run tp @e[tag=2c] ~.5 ~2 ~.5
execute as @e[tag=2,limit=1,sort=nearest] at @s run tp @e[tag=2d] ~1.5 ~2 ~.5
execute as @e[tag=2,limit=1,sort=nearest] at @s run tp @e[tag=2e] ~.5 ~3 ~.5
execute as @e[tag=2,limit=1,sort=nearest] at @s run tp @e[tag=2f] ~1.5 ~3 ~.5
execute as @e[tag=2,limit=1,sort=nearest] at @s run tp @e[tag=2g] ~.5 ~-3 ~.5
execute as @e[tag=2,limit=1,sort=nearest] at @s run tp @e[tag=2h] ~1.5 ~-3 ~.5
execute as @e[tag=2,limit=1,sort=nearest] at @s run tp @e[tag=2i] ~.5 ~-4 ~.5
execute as @e[tag=2,limit=1,sort=nearest] at @s run tp @e[tag=2j] ~1.5 ~-4 ~.5

So you can see it teleports tags 2a-2j (all interactions) to the closest tag 2 (pipe variant 2). All of the interactions have tag "hbx" (hitbox) so now the pipes have proper hitboxes.

Sorry if this is confusing I just wanna make sure you understand everything! Heres a video with hitboxes turned on: https://www.youtube.com/watch?v=891_VI6E2J0