I think the best option for FPGA is https://www.analogue.co/pocket , over the years it got fairly extensible, it can play multiple systems, etc. If your focus is Gameboy, then this is a good option. My preference is Miyoo Mini Plus and similar, since it can play more platforms and it has things like pico8 with splore (you can browse the online "pico store" for any of the thousands games...), it can play DOS games (like Keen).
If you want to tinker with the solution, then the board you highlighted is pretty good...
Yeah I'm mostly interested in Gameboy and GBA games (mainly pokemon hack roms - through flashable cartridges - and a few other titles), but the analogue pocket is a bit pricey and seems hard to find in stock. I heard that Taki Udon is working on an affordable FPGA console, maybe I'll wait for that one... In the meantime, I ordered the FPGBC, curious to see if it works well and how the overall gaming experience is :)
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Btw, I just noticed there's quite cheap Miyoo Mini Plus on Ali. So just highlighting that as an option. The display isn't the exact resolution/ratio for GBC/GBA, but it plays these games really well (I got through Pokemon Modern Emerald on it...)
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