They recently released the closed beta, and gave streamers HEAPS of keys.

Jump on any of the streamers playing Battle Aces and enter their giveaways. I managed to snag a key for myself yesterday. https://twitch.tv/directory/category/battle-aces

So far:

• works on Linux via proton-GE
• 10 minute maximum games which I really like having a family. I can jump on have a quick 1v1 and jump off
• instant build for units makes for a unique mechanic and honestly is quite fun
• 1v1 was instant queue times
• 2v2 (with a friend) took over 5 minutes, not sure if bug, or no-one was on
• region based queues I think, and you can change it in the options

All in all I could see myself playing this for at least 2 months on this single map, and with more maps I could play it for a long time