Interested in the game but need clarification..

I have been eyeing this game for quite sometime now. Just realized it just got steam release so I have some questions I would like to ask.

1. can I play this on steam deck (steam version)
2. is this always online? Or can I play even without internet?
3. can I unlock most stuff via just playing (don't want to do extra micro transaction)?
4. how is this game really like? I am into rougelik4 deck builder like slay the spire and monster train, will I like this game?

Thanks in advance for your answer.