Happy to hear my fixes worked! Still new to the whole "updating and bug fixing the game" thing!
The Ring Monitor and the economy in it's current state are mainly the way they are so you don't have to replay the first scene more than like, 4 times. As more Toys and Upgrades get added I will be adjusting prices and making it more of a light balancing act, especially in tandem with other mechanics I plan to add to the Tamagotchi scenes.
And your idea for a new upgrade is actually already planned for the first major update alongside another upgrade!