Epic pinball for MS-DOS, Specifically the Android table will forever be a core memory of mine. Any decent pinball games nowadays?
Ive got two BT enabled G Shocks, one of them my daily driver for the past year and I can't fault it. It's just a normal watch, with normal watch battery life and normal G Shock robustness - except that it savese having to pull my phone out of my pocket everytime I get a notification.
Going to be completely honest, havnt delved into the fitness tracking much - the watch appears to have a step counter but unsure if this is app dependant or not.
Gran Turismo 2 - I have no idea why to this day, I play it atleast weekly. To me, everything about this game is timeless from the Soundtrack, selection of cards to the graphical style (it has to be played on a CRT mind you OR an emulator with some mods to fix textures and clipping properly.).
Casio need to market their watches better, they have the Smartest dumbwatch**** of them all - 
Casio have several lines that support Bluetooth - essentially will beep and vibrate on Notifications, calls and messages. Does basic fitness tracking. It also does all of this whilst basically being indestructible and a battery life of atleast 3 years.
No one seems to know this and I blame Casios poor marketing - I didn't know any of this until I bought a new G-Shock and realised it had a BT label in the manual.
What about a Turn-based RPG like Yakuza Like A Dragon? It's open world, plays great on the deck, has amazing world building/ambience to it and it's incredibly replayable. You can frequently find it on sale (or get a cheap key from G2A) and its sequel is coming out soon.
For me, it feels like an old school RPG with modern quality of life improvements and plenty of character.
A 30w will suffice but to ensure charging under all circumstances regardless of load, 45w is the benchmark. For context, the charger that is included out of the box is 45w.
When looking for a power bank suitable for the Steam Deck it needs to support atleast 45W Charging and you a suitable cable that will support this capacity (i.e a DECENT quality 3C cable).