Stormgate
It’s like 90% StarCraft 2 and 10% Warcraft 3. The competitive RTS part is promising but it didn’t show me anything new. Depending on the lore and campaign it may get more interesting, so far it’s neutral.
Millennia
It starts very similarly to Civ 6 with even more kinds of resources. The current version of the UI seemed confusing and the poor performance (on linux) stopped me from finishing the demo.
With the currently available Android tablets the software really limits its uses. Many of the higher quality product focus too much on productivity without success. But this creeps up the prices so much that makes them hard to justify for entertainment.
I think there are only a few use cases where tablets shine:
Longer software support is only available from just Samsung or Google and I can’t justify the prices of those if a laptop can replace it. Here a Pixel Tablet or a Tab S9 costs the same as 13" laptop with oled screen (Zenbook S 13) with “unlimited” software support.
I do own a T20 Mini and an old ThinkPad and I really like reading on the Android tablet even with the slow SoC and medicore screen, but bring a real laptop along for longer trips.
Maybe you could use a USB keyboard or mouse connected trough a dock or OTG converter to allow file transfers.