ツーポイントミュージアム：エクスプローラー アップグレードパック - レビュー・評価・同時接続数

Think of this more as a "deluxe game" edition rather than a conventional DLC. It gives you several cosmetics, but also a bonus exhibit when starting each map which gives a modest bump to the early game. You also get extra Kudosh, which is an in-game currency used to unlock furniture which is a mix of functional and decorative items. Finally, there is an additional pop-up museum (small challenge level) which if you complete successfully unlocks an expedition site for a very good mid-game exhibit. On the whole, this is a "support the devs and get some bonus items" purchase rather than a full-fledged expansion pack.