Interesting question! I don't have any hard data. You could try mining online databases https://www.lemonamiga.com/games/ https://www.lemonamiga.com/games/ ht

Interesting question! I don't have any hard data. You could try mining online databases https://www.lemonamiga.com/games/ https://www.lemonamiga.com/games/ https://csdb.dk/ https://csdb.dk/ I'd be surprised if the average is significantly greater than 1 release per day. Retro styles are all the rage. But its much easier to develop on Pico-8. A good proxy is probably community size and passion. And there I would say the biggest market is undoubtedly Nintendo retro. Most are available via emulation, re-release. But the install base of working vintage consoles must be quite sizable still. Best of Luck and please let us know what you uncover ;)