I'm surprised that we are mentioning a paid site here and we are not mentioning tools like monkeytype and typeracer where you can do good practice for absolute free. In this particular space monkeytype is a super customizable tool that can fit tons of different people.
IMHO the video game scene is better than ever. Maybe you don't like what 90% games have become and that is fair. But go to itch.io and you will find a wide array of different games that will for sure suit your tastes. Maybe they are not that popular.
I guess the problem is the store. The app allows to access valve's store (which is far cheaper than games in the apple store). If they remove the ability to buy games I am sure the remote desktop app would be ok.
I prefer using tmux for this to be a bit more secure. I wrote a blog post about this [0] since it is a bit of a pain in the ass to set up properly. Maybe you should explore this too for your product.
It sounds too much like general midi. It is better for electronica than for any other genre.
Impressive nonetheless