Hey :D Thanks for trying the game; I can give some help of course, but you may find help from other players in the #demon channel of the roguelikes Discord too if you're up for joining: https://discord.gg/t9cVHhj
As for some starting tips, I can offer a few:
- You're probably already doing this, but try to recruit and begin developing one or even two good healer allies as soon as you can. Faeries are the best choice for starting this, but a Zaltys is better than nothing. You won't usually want both out at once, rather, start with one and switch to the other if the first one's SP begins to run low in a longer fight. Once you have some credits, many players often recommend fusing an extra Faerie with a Gandayah to get a Lifegiver Gandayah. Though the specific results of fusion are random, this often results in a fairly tanky and effective healer.
- Focusing on ranged attacks, both for your summoner's starting ability and for what your allies learn, can be helpful initially, when few enemies possess them. Even the Red Cap's humble Throw Rock, if passed around to allies with decent Strength and Agility, can add up fast.
- Boosting your summoner's ability to escape danger can be a big help to early survival. Look for abilities that move you quickly across multiple spaces, or which give you faster movement speed in general.
- Recruit a full stable of allies as soon as possible, even if they aren't necessarily the ones you want long term. The first two floors are designed to be a "recruitment drive" and should be a good source of initial allies.
- The Orb of Power's main early advantage is that it gives you a way to spend large amounts of credits to convert recruited demons into abilities you choose for a fairly extensive list based on the demon in question. This can be great if you're planning for a certain type of build, but you may find Crown of Glory's increased stable capacity to be a more straightforward advantage in the early going.
I hope this helps. :D I apologize for the delay in responding, it's been a busy week here. Good luck in the Tower!