I've played A LOT of roguelikes, so I have a lot of feedback.
Wow such a slick interface!
Gameplay-wise, I REALLY dislike choosing from 3 cards. It feels like there's very little strategy. I pick card (is good), then I have a 50/50 chance of next card being bad. So either keep what I have, or HOPE the next one is good. This... just isn't an interesting choice? Do the hand sizes increase to over 3? If the hand sizes were 5 this could be an interesting choice as it continues to escalate, but 3 feels too low.
Yes you can buy one-time helper powers, but having played dozens of roguelikes I've been trained NOT to waste money on temporary consumables.
A surprisingly polished intro cinematic is a cool start. Not sure it's needed, but cool nonetheless.
I found many card effects to be confusing. Do words like Hortons or Iskabon have any real-world meaning? It can help to ground players using FAMILIAR terms.
Sounds are perfect.
I don't understand why you want to buy new cards. Each round appears to have TWO cards from my deck used, with one bad card added. Why exactly should I increase my deck size? Conventional roguelike wisdom is to DECREASE your deck size to ensure consistent hand draws.
I don't understand which draws have a bad card inserted. Is it just random? Is there 5 per deck? I have no idea. You just ALWAYS have to use the magnifying glass to look? If that's the case, it should just ALWAYS be visible and I shouldn't have to click anything.
The starting deck has too many cards with different effects. Too much to read, too much is initially hidden. Most players won't open their initial deck to view it, so you need to keep the starting deck simple, and then let players make VISIBLE decisions to customize it.
The first round is too hard! I feel players should NEVER lose the first round.
This is really promising! I look forward to see how this develops.