Yes, yes.. the game is in early access but it is very polished and could probably pass as a full game. It is a hybrid tower defense/ rougelike rpg similar to FTL. In DotE you start with 2 characters at your crashed ship/power crystal where you are faced with a door.. that opens into other doors wooooo!! Each time a door is opened a random event occurs, similar to traveling to a new planet in FTL. Where it differs from FTL is the turret defense aspect, you must protect your power crystal and carry it to the next floor. There is a pretty good chance that opening a door will cause a wave of enemies to come after you and your crystal so you must power rooms and equip them with turrets and modules to protect yourself.
^Pretty terrible explanation.. just check it out! It's under 10$ on steam, I've already racked up 50h+ and still have plenty of characters to unlock and still haven't made it to the 8th floor(current last floor)