Wow! So stunned right now! And ecstatic that you enjoyed the game! Thank you very much!
And yes, I was 100% inspired by Yoshi Goes to Tesco. I'm a huge Vinny Vinesauce fan and I saw Vinny play it, and was very intrigued to learn how I could make a game like it but with my own humor and inside jokes. (maybe some jokes were a bit too inside.)
As for the secrets, Yes. There is another roblox splat sound object. (I can probably guess which one you missed, It's really hard to find.) And yes, it does do something. And about the GenoCoins™. There is a very obtuse, dumb, very dumb hint on the computer. 3/4 of the images have a (very hard to read, and I should probably change it with an update) hint embedded into the title of the MS paint window and file on the desktop.
Also, This is embarrassing, but I had Hong Kong 97's theme in the files of the game, But it went unused. Despite this, I already stuck it into the credits that are very lengthy to change.
Just consider it a reference to your game. :)
Glad you told me about the stream too! Watching it all right now!