It's at the max already. There's probably something else that needs to be tweaked to rebalance the game at these speeds, but given I don't have a way to play the original game myself it's going to be hard to nail down. I think taking a break from it for while and then relooking at it again at some point in the future might help. Fortunately most people will still be able to enjoy the game without hitting this problem.
Viewing post in Tomy Sky Attack
I went back to studying the original and i noticed that some sharks when they reach the player spot hang there for a little longer than normal maybe like 10% of the time and others disappear quicker than normal as well and other sharks "join that queue" going up the channel towards the player taking longer for that channel to clear which will make it harder. I don't expect you to do it now and I totally understand you wanting to take a long break from it, hope this helps :) Cheers
my skill level at its finest lol 6,625 (lvl 29) unedited video, thought i'd post this as it might give you other ideas as well :) https://gofile.io/d/R3stln
It's entirely upto you if you wanted to do it where the sharks queue up at the player slots like the original or just increase speed of sharks coming at the player gradually after each level indefinitly, i think doing both of these will make it too difficult so it's your choice which one you put in, cheers :)
Okay, I've updated the build and went with increasing the speed of the sharks coming at the player. From Level 15 onwards the speed will increase by 10% with each new level. If it gets too fast too quick I can drop it back down to 5%, but with 10% you should definitely notice the increase in speed. Let me know how it goes.