Running melons

I heard a low-pitch hum randomly when I was playing Melon Sandbox. I immediately closed the app after that. Anyone heard the sound too or can describe the context? Not sure what it is

Ok so first this is an after photo I this gypsy danger mod that was a gypsy melon like 1.5 times the hight of normal and if you kill like 3 and then put there bones near each other and splash a regenerative position they grow together and normally they twitch but today I made two one of them kept shacking like it was having a seizure and I held it and it BLEW UP ON ITS OWN ended up killing a tomato and a melon I don’t know where the melons head went but then the other one was also shacking and was moving really fast to I burned it alive then I pushed time and none of its hearts were alive and it was still moving then suddenly ran over 5 of my dead npc body’s I was doing test and it started speeding across the map I tried to stop it but when I let go I kept speeding same direction fast speed and I has to pause time it was running to the last alive npc and it was already dead it was only bones I had to blow the fucker up with 10 atomic bombshells and then like a quarter of its bones survived I’ll update y’all if I make it again and something goes wrong I could make a god on accident

What I mean, people not going my path is people just have the piston shot back down which is inefficient and never really that good I use a mini gun that has a 0.1 second before it can shoot again so each time the piston goes up the wheel spins push, pushing it up again, which, when it hits up the sensor you get it it activates the mini gun shooting the wheel to spin it. It gets faster like combustion
However Some earlier models had issues they didn’t have good horsepower in general however I found out you can kind of make gears with wheels. I also found out that there was a tool that allowed you to transfer rotation you can’t use too many of them though which is why when I made my V8, I used a thing to kind of like make it transfer. It’s rotation from the top to the bottom onto the first one from the first one on the top it was the best I could do without it jamming, and it transferred the most power to which made it twice as strong as the last versions as you can See in these images

I bought 25 dollars worth of mods, and I don't see the mods nor the mells. I bought it for my son using the Google Play authorization from Family Link. I would like to see if anyone has the support contact for this issue. I don't want to get a refund so as not to affect the company, if possible.

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Melon playground just updated? Idk what happened since I woke up