I enjoyed my Tacoma play-through, done in a single sitting and I think it's worth grabbing and actually playing. You can see my previous thoughts here. You can grab your free copy here, which requires subbing to their newsletter.
As for the Indie Mega Week sale, there's actually quite a number of seriously good Linux games so here's a few picks:
- Planetary Annihilation: TITANS - 75% off - Not great on AMD/Intel but they're working on it.
- Darkest Dungeon - 70% off
- Tabletop Simulator - 50% off
- Duskers - 50% off
- Rocket League - 40% off - Currently my most played and absolute favourite game.
- Owlboy - 40% off
- Opus Magnum - 33% off - Still in my top 10 puzzle games, see some thoughts I had here.
There's obviously more on offer and DLC for multiple games, well worth taking a look if you're after a new game.