Cool concept! I have really liked a lot of it.
In a Browser window without zooming in the card text is very hard to read. I have also found the issue that restarting after zooming makes your hand spawn in much more to the right with some cards outside the window.
I also found it a bit frustrating to see rounds clearly unwinnable, as in with no way to draw extra cards and clearly not enough damage.
All of these are the kinds of issues expected in game jams with limited time so nothing that's a real problem and I do really like the concept of the simplified otk puzzler.