Well for one, Sneaking on Piano Keys begins with you telling the reader to look at something else even before they know if they like the story they clicked on. This story is also barely a month old on Tapas; it's going to take time for people to find and be interested in it.
Let's look at your synopsis first.
"After years of homeschooling and appointments with a psychologist, Max has finally been considered ready to go back into the outside world, and everything goes well for a while, but then karma and puberty decide to strike him down and now he has to pretend to be normal or he might end locked up for "being crazy", which isn't easy when the dead (many of which are mangled in some manner making them horrifying to look at) are begging you for help.
You have some overly long sentences and some unnecessary information. Information the reader could and should learn about while reading. Here's my edit:
"After years of homeschooling and appointments with a psychologist, Max has finally been considered ready to go back into the outside world. Everything goes well for a while, but then karma and puberty decide to strike him down. Now he has to pretend to be normal or he might end locked up for "being crazy", which isn't easy when the dead (many of which are mangled in some manner making them horrifying to look at) are begging you for help.
Instead of being one long uncomfortable sentence, it's three more manageable sentences.
I'm only going to speak on the first two episodes since that sets the tone for how the story is going to go.
You started the story with a character waking up, and while this isn't a no-no in terms of writing, it is cliche and shows inexperience.
You have a few typos, and your sentence structure is wildly all over the place. Again, some are distractedly too long. Others are to the point, but not in an interesting way. For example:
"He spent the last few years taking classes at home so he wouldn't fall behind the other kids of his age, studying Portuguese so he could do something as simple as ordering a pizza and he went to appointments with a psychologist to help him cope with the changes in his life"
This is a paragraph in itself. It could easily be split into two or three sentences, like so:
"He spent the last few years taking classes at home so he wouldn't fall behind the other kids of his age . Max studied Portuguese so he could do something as simple as ordering a pizza . He also went to appointments with a psychologist to help him cope with the changes in his life"
I mentioned before that it's cliche to start a story with the character waking up, and it is, but you can always make it more interesting to show off a character moment. Maybe instead of Max waking up on time and perfectly ready to start the day, you have tired from a sleepless, excited night. Maybe his aunt or uncle come in to wake him up, but he's already awake and they catch him practicing how he's going to introduce himself to his peers with his cat. Maybe he's late, and there has to be something extreme and lucky to happen for him to get to school on time. Something, anything else could work.
I think the mention of Max needing therapy should've come up later when it was plot relevant. Maybe he had a tough time at school that first day and he comes home and fiddles with the piano keys. Then there's the opportunity for his aunt to come in, ask him about his day. They have character moment together and the reader is informed of the psychologist. And then you can also have the aunt remind Max that he could play for rich people one day. Boom. Three birds with one scene. Literature is all about informing the reader in the most efficient and interesting way possible. (Also even if the psychologist is mentioned in the synopsis, there is a chance that someone will skip it and get right into the story.)
This is just a personal gripe, but I found the use of -hyphens- to show speech confusing and frustrating. If it's an aesthetic thing I understand, but using "quotation marks" is just as well and you won't turn off readers that way.
I don't really care for Daniel's introduction. . . or Max's. Probably because I don't know what they look like. Maybe physical descriptions are hard for you, I can understand that. Even if that's the case, you should still take the time to right a sentence or two describing your characters.
You can easily write: "Max was a kid of thirteen years, with tanned skin, dark brown hair and almond sea green eyes. His round nose scrunched up due to the cat hair in the air, which caused his scarred hands to brush it away."
And while those sentence may not describe your actual character, it does give whomever reads a clearer idea of Max in their heads while also raising some questions, such as: Why is his skin tanned and why does he have scarred hands? Is it because of his cat, or is it because of something else?
The dialogue is curt, uninteresting and stilted. The conversation between Daniel and Max isn't the worst but I feel as though it could have been executed better.
Lastly, I don;t really understand who Max is. Now may that gets better as chapter goes on, but as for right now, I, and anyone who reads the first two episodes, doesn't have even a little bit of an idea of what t expect from this character.
I'm not going to read Sucked into the Game. I'll just say, if you find any similarities in that story and Sneaking on Piano Keys, then refer to the critique I gave here. There's not a lot of intrigue for these stories from my own perspective, even though I like the premises. I mean I loved ParaNorman which has a similar premise to SOPK and I like murder mysteries which is similar to SITG. It's a matter of execution. You're very early on in terms of posting to a platform so as you get better you'll have more eyes on your work.
Good luck and I hope this helps.