If you like Pokemon like games, take a look at Cassette Beasts! Very charming game!

Backpack hero is very cute and fun, and runs very well through proton.

Well steam has proton, which can run many, many windows games at generally good speeds. I suggest looking at older games and indie games, as they will run best on your Xe. For example, the Heroes of Might and Magic series, particularly 3 and 5 are very good 4x/RPG hybrids. Find interesting games then go to protondb.com and see if its 'gold' or better

Go nuts over on GOG!

So many great titles for cheap.

Starsector. Sseth has a really good review of the game.

If you like text-based adventure games, check out ifdb.org for a massive store of free and abandoned text-based games. You can play in-browser or on any OS with a native client, Linux and Android included

using emulators could be a good idea. if battery life is an issue then NES, SNES and GBA RPG games could be a good choice

caves of qud is quite good, its tile based roguelike.

ofc battery drains if not connected to the electricity network man, these graphics card are not meant to run games if not when they are charging

Anyway you can try SuperTux and Xonotic

Bloons TD6 is pretty fun and light.

Most indie games that are deck verified should work just fine. I'm playing DREDGE on my deck at the moment - absolutely recommend this one and the battery life is phenomenal. Apart from that Factorio or FTL will keep you busy for days (and nights...)

Tales of Maj'eyal is my go-to roguelike when I have some down time on laptop.

Cave Story is good / hectic / hard platformer. I might be wrong but I think it was made for Linux first

Also, if you install RetroArch, you can play all the emulated systems.

Stronghold Crusaders, or Command and Conquer.

Nostalgic childhood games.

I recently played through every Deus Ex game on linux, first 2 are oibviously low end, and maybe Human Revolution , it came out in 2011. the original and Human revolution are pretty good if you like rpgs, Invisible war the second game is alright but pretty light on some elements that make those two great, cause it was made i think with thje original xbox in mind instead of pc.