A very neat concept and very impressive to pull off in RPG Maker! I've never seen a card battle inplementation in it before so it's extremely cool to see. I think I encountered two bugs. The first was that I seemed to be doing the same two screens over and over again. After leaving the table I'd be on a screen with a tent and a campfire, then move north to a screen with one fight on it. Win or lose, when I next left the table I'd be back on the tent/campfire map again. The enemies changed, but hte map did not. The second bug is that after repeating this several times the game froze and hung.
Bugs aside, I have mixed feelings about parts of the game. It felt difficult to play strategically - the combat is very reminiscent of Slay the Spire, but without seeing how much damage is incoming or how much block an enemy has it made it much much harder to feel like I was making meaningful strategic choices. I felt like my win or loss was mostly down to RNG.
I found a lot of mechanics just very hard to follow. I didn't particularly want to go and look up status conditions after battle, especially after I looked up Regen and the Knight just told me "seems self explanatory"
I'm very conflicted over how the corruption and player pregnancy works. Personally, when I play a preg game, I want to make the character pregnant, so when you get pregnant by losing, and enemies make you pregnant in combat and your cards put you back to normal, that's frustrating. Every time I got offered cards or saw a shop I was looking for a card that would boost corruption or something like that but I never saw any ability to do so.
All that said, it's a really ambitious entry for a 3 week game jam! Great work and great potential!