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Backpack Battles sells 100,000 units within two days of Early Access release
(www.destructoid.com)
I really enjoyed the demo. I played about 20-30 hours, I think, which is a lot for me. It's a really enjoyable game. I bought it in a bundle with a game I already owned (StS) to save an extra 10% (the bundle deal still applies even if there's just 1 title in the "bundle').
I haven't played the full version yet, but I enjoyed climbing to diamond rank with both the classes available in the demo.
I got a Steam Deck since then; I think it should be a nice touch game with the back buttons (or DPad, maybe?) bound to rotate and the touch screen for moving items. (Or face buttons if you're left-handed, of course.)
I don't know if it will have lasting power for me, but I already got my money's worth from the demo and I expect the other two classes will get at least as much time from me.
It's a game where you build a combo of items, depending on what pieces you luck into finding, then try to solve the positioning puzzle you built for yourself to maximize item adjacency synergies. The buying is strategic, but the bag management is more an optimization puzzle.
If that sounds interesting to you, then you'll probably love it. Try the demo; it's free!