I am going to say this with great care.
48 is, technically, right. Nobody forces you to develop audiogames. It's not your job, you're not getting paid, you do it for a hobby and in some cases, receive some compensation for your effort. Now, do I think that this game is worth it's price? That's a different question.
I haven't played the game yet, but by the concept alone, I'd say no. I paid for feer only because it had something this game didn't, an illusion of progress and getting somewhere. From what I can tell from just reading, this game doesn't. Moreover, it seems to have an endpoint where as feer does not, but I am not too sure about that so feel free to correct me. No. I wouldn't pay for this.
Another thing you have got to consider is that it's Ivan's first Python project. Though he has programming experience, it still takes quite a bit to switch from one language to another do to huge syntactical differences. That also drives my point home, however. You typically don't charge for the first project, most of the time because the code can get rather messy and fixing it would require a complete rewrite of some functions, again, I speak from experience here, lol.
Finally, you need to consider Ivan's history when it comes to paid products. Look at BM and TK and then ask the question... is it worth it?
On the other hand, though, Ivan is also correct in the fact that he is paying host fees. Fees that are probably a better deal than the normal prices of the hosting companies, about $10 per month seems to be an average (I am only estimating based on what I have read). Knowing that fact does make me consider buying the game, but again, I won't. Not yet, at least. Not enough replayability, though this game is not the only thing that lacks in that department. Mailman does too, but I digress.
At least this topic seems quite a bit more civil than mine, so there is that to consider.