Yes it is (Miyoo mini plus). More convenient than steam deck, runs everything up to and including Playstation 1, just install OnionOS on it. Only downside is there's no bluetooth audio.
I bought an Analogue Pocket and installed a bunch of emulators and games from archive.org. Gameboy Tetris is great (I bought a cartridge from EBay) but for me, that’s the exception. I’ve tried a handful of the other games and came to realize that games from that era just don’t click with me.
It's the epitome of mobile Tetris. No 7-bag, zero input delay, and of course, color. It's easy to cheese because of infinite lock delay resets (and wall climbing).
I also enjoyed Tetris DS because of its extremely addictive Push mode in multiplayer. I may have had to retake CS301 because of that game.
Or you could get an r36s for less price which has a bit more power to handle some PSP, Dreamcast and N64 games. I honestly can't review it yet because it's still in delivery but /r/SBCGaming sold me on it.