It's great, but there's a problem, at least with my current config.
The game runs at 60fps, but in order to do so it seems that DOSbox puts the Deck at 100% workload, so the battery consumes like 16watts and the CPU goes up to 80°C, which is a lot for this kind of game.
I've been trying to fiddle with the DOSbox config, mainly the cpu cycles, but that didn't report any benefits. I'm no expert on DOSbox so maybe there's something that can be done, but I dunno.
My second option was to install Power Tools, to limit number of active threads and CPU speed on the Deck. This worked to some extent, game could maintain 60fps at times while consuming 8 or 9 watts, but also drop to like 30fps when turning the camera.
I'll keep trying to make it work, as the time I spent actully playing it was quite fun and comfy to play on the Deck.